题目
题型：不详难度：来源：
In a study published last month in the journal Science, Peter Ungar of the University of Arkansas and his partner, Matt Sponheimer of the University of Colorado, US, examined the teeth of our early human ancestors to find out what they were really eating.
They already knew that different foods cause different marks on teeth. Some cause scratches, while others cause pits (坑).The carbon left on teeth by different foods is also different. Tropical grasses, for example, leave one kind of carbon, but trees leave another kind because they photosynthesized ( 光合作用 ) differently.
Traditionally, scientists had looked at the size and shape of teeth and skulls ( 头骨 ) to figure out what early humans ate. Big flat teeth were taken to be signs that they ate nuts and seeds, while hard and sharp teeth seemed good for cutting meat and leaves. But this was proven wrong.
The best example was the Paranthropus (傍人), one of our close cousins, some of which lived in eastern Africa. Scientists used to believe Paranthropus ate nuts and seeds because they had big crests(突起)on their skulls, suggesting they had large chewing muscles and big teeth. If this had been true, their teeth should have been covered with pits like the surface of the moon. They would also have had a particular type of carbon on their teeth that typically comes from tree products, such as nuts and seeds.
However, when the two scientists studied the Paranthroupus, it turned out to have none of these characteristics. The teeth had a different kind of carbon, and were covered with scratches, not pits. This suggests they probably ate grass, not nuts and fruit stones. It was the exact opposite of what people had expected to find.
Carbon “foodprints” give us a completely new and different insight into what different species ate and the different environments they lived in. If a certain species had the kind of carbon on its teeth that came from grasses, it probably lived in a tropical grassland, for example.
小题1:The underlined sentence in Paragraph 1 probably means that _____.
| A．anthropologists can study the structure of human stomachs by studying their teeth. |
| B．anthropologists can study the diet of early humans by studying their teeth |
| C．anthropologists can learn whether humans were healthy by looking at their teeth |
| D．anthropologists can get the most useful information about humans from their teeth |
| A．Scratches on teeth are caused by eating nuts or seeds. |
| B．Pits on teeth are caused by eating grass or leaves. |
| C．Early humans with hard and sharp teeth ate meat and leaves. |
| D．Different foods leave different marks and carbon on teeth. |
| A．tell readers that they are one of our close cousins living in eastern Africa |
| B．tell readers they had different eating habits from modern humans |
| C．prove that size and shape of skulls does not show accurately what early humans ate |
| D．tell readers that living environment makes a difference to skull structure |
答案
小题1:B
小题2:D
小题3:C
解析
试题分析：在一份最近发表的杂志中研究人员声称如果眼睛是心灵的窗户，那么牙齿便是通向胃的大门。也就是说通过对牙齿的研究可以发现动物是以草本植物为食还是以肉为食，但是他们也提出其中也有例外情况，不能完全根据这种方法来进行判断。
小题1:B推理判断题。整篇文章讲述了科学家通过对牙齿的研究来判断他们所吃的食物，而且第二段也明确提出examined the teeth of our early human ancestors to find out what they were really eating.由此可知B选项正确。
小题2:D细节理解题。根据文章第二段They already knew that different foods cause different marks on teeth. 和The carbon left on teeth by different foods is also different.可知不同事物会在牙齿上留下不同的印痕和碳，所以D选项正确。
小题3:C推理判断题。文章第四段讲述科学家是如何根据牙齿的形状，大小和头骨来判断人类所吃的食物的，但是最后提出But this was proven wrong.然后下文讲了傍人的例子，来说明他们的错误判断，所以C选项正确。
核心考点
试题【If the eyes are the romantic’s window into the soul, then the teeth are an anthr】；主要考察你对题材分类等知识点的理解。[详细]
举一反三
EarthKAM is an educational activity and outreach(扩展)investigation that also results in remote Earth sensing and observation. Using the Internet, the students control a special digital camera fixed aboard the space station, enabling them to photograph the Earth"s coastlines, mountain ranges and other geographic items of interest from the unique advantage point of space.
While EarthKAM offers a powerful way for students to investigate Earth from the unique perspective of space, it is also inspiring the next generation of flight controllers for space programs—involving university students to control and operate the camera system and related activities from the ground.
In the interview, Brion Au, one of the investigation developers at NASA"s Johnson Space Centre, said，“EarthKAM is a payload(有效载荷)by students, for students. They are in charge. This system provides a viewpoint that the astronauts have...it"s just aweinspiring！”So far, students have captured more than 40,000 photos of the Earth from the space station as it orbited the Earth once every 90 minutes, traveling at 17,500 miles an hour. The team at EarthKAM posts these photographs online for the public and participating classrooms around the world to view.
Au explains that this education investigation is inspiring students to explore the world by examining Earth, while promoting social studies, art, geography, science, technology, and math, among other important lessons involving research and teamwork. EarthKAM was started by Dr. Sally Ride, originally flying on the shuttles. The camera is located in the window Observational Research Facility, also known as the WORF, one of many the station"s research facilities.
小题1:How have thousands of students experienced similar excitement as astronauts?
| A．In the space station. | B．In the spaceship. |
| C．Using a camera system. | D．Teaming up with astronauts. |
| A．Computer. | B．Recorder. | C．Telephone. | D．Radios. |
| A．University students" controlling the camera system. |
| B．University students" operating the camera system. |
| C．University students" related activities from the ground. |
| D．University students" investigating Earth from space. |
| A．The astronauts. | B．The students. |
| C．The investigation developers. | D．The teachers. |
| A．DR.Sally Ride explains the details of EarthKAM |
| B．Why the team at EarthKAM posts these photographs online. |
| C．EarthKAM provides a viewpoint that the astronauts have. |
| D．Brion Au explains the details of EarthKAM. |
Yet despite that, reading is increasingly unpopular among children. According to statistics, in 1997 23% said they didn’t like reading at all. In 2003, 35% did. And around 6% of children leave primary school each year unable to read properly.
Maybe the decline is caused by the increasing availability of computes games. Maybe the books boom has affected only the top of the educational pile. Either way, Chancellor Gordon Brown plans to change things for the bottom of the class .In his pre-budget report, he announced the national project of Reading Recovery to help the children struggling most.
Reading Recovery is aimed at six-year-olds, who receive four months of individual daily half-hour classes with a specially trained teacher. An evaluation earlier this year reported that children on the scheme made 20 months’ progress in just one year, whereas similarly weak readers without special help made just five months’ progress, and so ended the year even further below the level expected for their age.
International research tends to find that when British children leave primary school they read well, but read less often for fun than those elsewhere. Reading for fun matters because children who are keen on reading can expect lifelong pleasure and loving books is an excellent indicator of future educational success. According to the OECD, being a regular and enthusiastic reader is of great advantage.
小题1:Which of the following is true of Paragraph 1?
| A．Many children’s books have been adapted from films. |
| B．Many high-quality children’s books have been published. |
| C．The sales of classics have led to the popularity of films. |
| D．The sales of presents for children have increased. |
| A．the number of top students increased with the use of computers |
| B．a decreasing number of children showed interest in reading |
| C．a minority of primary school children read properly |
| D．a large percentage of children read regularly |
| A．An evaluation of it will be made sometime this year. |
| B．Weak readers on the project were the most hardworking. |
| C．It aims to train special teachers to help children with reading. |
| D．Children on the project showed noticeable progress in reading. |
| A． take greater advantage of the project |
| B．show the potential to enjoy a long life |
| C．are likely to succeed in their education |
| D．would make excellent future researchers |
| A．to overcome primary school pupils’ reading difficulty |
| B．to encourage the publication of more children’s books |
| C．to remind children of the importance of reading for fun |
| D．to introduce a way to improve early children reading |
Another advantage is that Mr. Leachim is flexible. If the children need more time to do their lessons they can move switches. In this way they can repeat Mr. Leachim’s lesson over and over again. When the children do a good job, he tells them something interesting about their hobbies. At the end of the lesson the children switch Mr. Leachim off.
小题1:The first paragraph of the passage tells us
| A．human beings are not as smart as robots |
| B．robots will take the place of man to rule the earth |
| C．we can only use robots to do some regular jobs |
| D．robots can help people in many different ways |
| A．To meet the needs of each student. |
| B．To talk to the students in different languages. |
| C．To keep everyone’s interest in his lessons. |
| D．To introduce more hobbies to the children. |
| A．not strict | B．not hard |
| C．suitable | D．changeable |
A. There are 250 robot teachers in the United States.
B. Mr. Leachim is run and controlled by electricity.
C. Bobby works in a large office building in Washington D.C.
D. The lessons taught by Mr. Leachim are given on a TV set.
Dogs are more capable of understanding situations from a human"s point of view than has previously been recognized, according to researchers.
They found dogs were four times more likely to steal food they had been forbidden, when lights were turned off so humans in the room could not see.
This suggested the dogs were able to alter their behavior when they knew their owners" perspective had changed.
The study, published in Animal Cognition, conducted tests on eighty-four dogs.
The experiments had been trying to find whether dogs could make their behavior suitable to react to the changed circumstances of their human owners. It wanted to see if dogs had a "flexible understanding" that could show they understood the viewpoint of a human.
It found that when the lights were turned off, dogs in a room with their human owners were much more likely to disobey and steal forbidden food.
The study says it is "unlikely that the dogs simply forgot that the human was in the room" when there was no light. Instead it seems as though the dogs were able to differentiate between when the human was unable or able to see them.
Juliane Kaminski carried out the research into how dogs are influenced by human circumstances.
Dr Juliane Kaminski, from the University of Portsmouth"s psychology department, said the study was "incredible because it implies dogs understand the human can"t see them, meaning they might understand the human perspective".
Previous studies have suggested that although humans might think that they can recognize different expressions on their dogs" faces, this is often inaccurate and a projection of human emotions.
“Humans constantly attribute(归属) certain qualities and emotions to other living things. We know that our own dog is clever or sensitive, but that"s us thinking, not them,” said Dr Kaminski.
“These results suggest humans might be right, where dogs are concerned, but we still can"t be completely sure if the results mean dogs have a truly flexible understanding of the mind and others" minds. It has always been assumed only humans had this ability.
小题1:According to the passage, which of the following is TRUE?
| A．The researchers made the test on dogs in eighty-four countries. |
| B．Dogs always obey and don’t steal forbidden food. |
| C．Dogs may adapt their behavior in response to the changed circumstances. |
| D．The research is carried out to find out how dogs are influenced by light. |
| A．Dogs---Our Loyal Companions Understand Us Most. |
| B．Dogs Are Our Best Friends. |
| C．Dogs Can Understand Us In a Way, Researchers Say. |
| D．Dogs Have Certain Qualities and Emotions of Human Beings, Researchers Say. |
| A．Textbooks. | B．Advertisements. | C．Instructions. | D．Magazines. |
| A．an argumentative writing | B．a feature story |
| C．a dog show review | D．a research result |
It was the latest sign of the effects of desertification: Overgrazing, deforestation, urban sprawl(无计划地扩展) and drought have expanded deserts in the country"s north and west. The shifting sands have gradually moved onto populated areas and worsened sandstorms that strike cities, particularly in the spring.
Winds blowing from the northwest have been sweeping sand across the country since Saturday, affecting Xinjiang in the far west all the way to Beijing in the country"s east. The sand and dust were carried to parts of southern China and even to cities in Taiwan, 1600 miles (2600 kilometers) away from Inner Mongolia where much of the pollution originated.
The sandstorm in Taiwan, an island 100 miles (160 kilometers) away from the mainland, forced people to cover their faces to avoid breathing in the grit(砂砾) that can cause chest discomfort and respiratory problems even in healthy people. Drivers complained their cars were covered in a layer of black soot in just 10 minutes.
In Hong Kong, environmental protection officials said pollution levels were climbing as the sandstorm moved south. Twenty elderly people sought medical assistance for shortness of breath, Hong Kong"s radio RTHK reported.
The latest sandstorm was expected to hit South Korea on Tuesday, said Kim Seung-bum of the Korea Meteorological Administration. The sandstorm that raked(掠过) across China over the weekend caused the worst "yellow dust" haze in South Korea since 2005, and authorities issued a rare nationwide dust advisory.
Grit from Chinese sandstorms has been found to travel as far as the western United States.
China"s Central Meteorological Station urged people to close doors and windows, and cover their faces with masks or scarves when going outside. Sensitive electronic and mechanical equipment should be sealed off, the station said in a warning posted Monday on its Web site.
State television"s noon newscast showed the tourist city of Hangzhou on the eastern coast, where graceful bridges and waterside pagodas were hidden in a mix of sand and other pollution. In Beijing, residents and tourists with faces covered scurried along sidewalks to minimize exposure to the pollution.
A massive sandstorm hit Beijing in 2006, when winds dumped about 300,000 tons of sand on the capital.
小题1:We can learn from the text that .
| A．the sandstorms were purposely made by China. |
| B．the writer thinks that China government should be responsible for the pollution. |
| C．the sandstorms badly affected the air in US. |
| D．China"s Central Meteorological Station will be closed. |
| A．Xinjiang | B．Hangzhou | C．Beijing | D．Inner Mongolia |
| A．breathing | B．digesting | C．hearing | D．walking |
| A．South Korea seldom issues nationwide dust advisories. |
| B．Taiwan is 1,600 miles from Beijing. |
| C．Sandstorms have hit Beijing more than once. |
| D．In Hong Kong some old people need help for shortness of breath caused by sandstorms. |
最新试题
- 1Maybe ten-year-old Elizabeth put it best when she said to he
- 2把下列句子补充完整。 （ ）碧绿的菜畦．，光滑的石井栏，高大的皂荚材，紫红的桑葚；（ ）鸣蝉在树叶里长吟，肥胖的黄
- 3 The government of our school brought few ________ benefits
- 42010年下半年，我国接连发生多起煤矿爆炸事故，造成重大人员伤亡和财产损失．煤矿发生爆炸事故的元凶是煤矿坑道气中含有的甲
- 5下列说法正确的是[ ]A.考察对象的全体叫样本容量 B.总体中的一部分叫个体C.样本中个体数
- 6阅读下列材料：材料一 仲舒复对曰：“……春秋大一统者，天地之常经，古今之通谊也。今师异道，人异论，百家殊方，指意不同，是
- 7作文。 自然界的山川草木使我们流连忘返；文学作品中的精彩世界令我们心驰神往。家乡的风土人情，丰富的人文内涵值得感悟；课
- 8对于同温同压下等物质的量的CO2和CO结论正确的一组是( )①分子数相同 ②原子数相同③碳原子数相同
- 9利用任何机械做功时，______对机械所做的功等于机械克服______所做的功，也就是使用任何机械都不能______．
- 10已知回归直线的斜率为2.03，样本中心（5，11），则回归直线方程为（ ）A．y=2.03x-0.85B．y=2.03
热门考点
- 1设斜率为2的直线l过抛物线y2=ax（a≠0）的焦点F，且和y轴交于点A，若△OAF（O为坐标原点）的面积为4，则抛物线
- 2阅读下面短文并回答问题，然后将答案写在横线上(请注意问题后的词数要求)。 Every year in the f
- 3如图所示，用精确度为0.1mm的游标卡尺测得一物体的长度为1.34cm，这时候游标尺上的第______条刻度线与主尺上的
- 4下列字的注音完全正确的一项是[ ]A．沉湎（miǎn）倒坍（tà）袅（niǎo）袅烟云主观臆（yì）测 B．赢（
- 5某地位于10°W，25°S，关于该地的判断正确的是 A．该地位于东半球B．该地位于北半球C．该地处于中纬度地带D．该地属
- 6United Nations urged the country to give up the nuclear plan
- 7下列框图题中，已知A、E、F、H是单质，其中只有A是固体，其它都是气体，且H是呈黄绿色；B是最常见液体，G的焰色反应呈黄
- 8一个袋中有大小相同的标有1，2，3，4，5，6的6个小球，某人做如下游戏，每次从袋中拿一个球（拿后放回），记下标号．若拿
- 9项羽认为自己力能举鼎，不听劝谏，结果在乌江自刎。项羽的失败启示我们[ ]A．人应自尊也应自卑
- 10边长为L=0.1m的正方形金属线框abcd，质量m=0.1㎏、总电阻R=0.02Ω，从高为h=0.2m处自由下落（金属线