题目
题型：不详难度：来源：
ient lake on Mars recently, increasing hopes of discovering evidence that billions of years ago the Red planet hosted life.The lake, which dates back some 3.4 billion years, appears to have covered as much as 80 square miles and was up to 1,500 feet deep, said the team from the U
niversity of Colorado.“This is the first clear evidence of shorelines on the surface of Mars,”said Boulder’ s research associate, Gaetano Di Achille, in a study published in the latest edition of Geophysical Research Letters.
“The identification of the shorelines and accompanying geological evidence allows us to calculate the size and volume of the lake, which appears to have formed about 3.4 billion years ago.”
Analysi
s of the images has shown the water carved out the canyon (溪谷) in which it was found, which then opened out into a valley depositing (使淤积) sediment (沉积) which formed a delta (三角洲).“Finding shorelines is a great discovery to us,” said assistant professor Brian Hynek, adding it showed the lake existed at a time when Mars was thought to have been cold and dry.
Scientists believe the oldest surfaces on Mars formed during the wet and warm era known as the Noachan epoch, about 4.1 billion to 3.7 billion years ago.
The newly discovered lake is believed to date from the Hesperian era and postdates the end of the warm and wet period on Mars by 300 million years, according to the study.
Scientists believe deltas next to the lake may well hold secrets about past life on Mars as such places on Earth have become the natural deposits of organic carbon and other markers of life.
小题1:The size of the lake found on Mars is ______.
| A．80 square miles | B．1,500 square miles |
C．3.4 billion square miles | D．300 million square miles |
| A．hot and wet | B．wet and warm | C．cold and dry | D．cold and wet |
A．Because similar places on Earth have become natural deposits of marker s of life. |
| B．Because someone has put secrets about past life on Mars there. |
| C．Because past life has been found in other deltas on Mars. |
| D．Because some people are said to have already seen life marks there. |
| A．The Noachan epoch was a wet and warm era. |
| B．The lake might have existed 3.4 billion years. |
| C．The discovery can’ t fully prove that the Mars once hosted life. |
| D．The lake traces prove that there exists life on Mars now. |
答案
小题1:A
小题1:C
小题1:A
小题1:D
解析
核心考点
试题【US researchers have found traces of an ancient lake on Mars recently, increasing】；主要考察你对题材分类等知识点的理解。[详细]
举一反三
As a freshman your classes should be easy. After freshman year your classes will become a lot more difficult, so I advise that you get down to business early in the first year. There are two very easy things you can do to increase your knowledge as a freshman. The first is to just go to class and the second is to always do your homework. I also highly advise that you do it on your own and try to stay disciplined(遵守纪律的). It is too easy to put your homework away and then get really behind and not be able to learn everything before a mid-term or final exam.
小题1:The author advises freshmen to live in the Tree Dorms because ___________.
| A．it is across the parking lot from Slade Hall |
| B．it is small and quite far away from the playground |
| C．there are many second and third year students there |
| D．there are many freshmen and more activities |
| A．Near Miller Hall. |
| B．Far from Tree Dorms. |
| C．Beside the car park. |
| D．Near the classrooms. |
| A．Remember to do homework by discussing it with others. |
| B．Finish homework and go to class every day. |
| C．Try to spend more time in the library. |
| D．Be able to learn something before a mid-term or final exam. |
| A．tell new students how to get used to college life |
| B．tell new students about their teachers and dormitory |
| C．show the differences between college and high school |
| D．tell readers about some funny things at Bentley College |
There are many ways to celebrate this special month of graduation. You can have photos taken with your classmates and teachers, or dine out together and exchange gifts.
High school students in Western countries such as the United States and Canada usually have a prom to mark their graduation. It’s to mark the time kids turn into young men and women. After the prom, teenagers either go to college or find a job. It means they are no longer as dependent on their parents as they were before.
At the prom, boys usually dress in dinner jackets and bow ties, though many different types of formal clothes are worn. Traditionally, girls give boys matching boutonnieres ( 佩带在扣眼上的花). Girls traditionally wear formal dresses, or dress to shock or be noticed, in shiny or brightly colored materials.
Common prom activities include dining, dancing, the crowning (加冠) of a prom king and queen, and just talking to friends. In some cases, high school students collect funds for their class prom through the four years of their high school.
High schools in or near large cities may rent ballrooms at expensive hotels or, to be unusual, in a pleasure cruise boat.
But often costs are cut by simply using the school gym. Students make a lot of effort to decorate the gym to make the event special. The music played at the prom will be the most popular kinds, like rock and hip-hop.
The students elect the Prom Queen. She is partnered with a Prom King who is elected similarly. These are great honors that the pair take very seriously. The two dance with each other to celebrate their election.
小题1:The word "prom" is probably closest in meaning with________.
| A．a party to celebrate graduation | B．a dancing competition |
| C．a fashion show | D．an election ceremony |
| A．Renting a ballroom. | B．Taking a cruise boat. |
| C．Holding it in the school gym. | D．Wearing informal dresses. |
| A．Music is played at the prom. |
| B．They take pictures at the prom. |
| C．The King and Queen dance with each other. |
| D．They wear formal clothes or special clothes. |
| A．They don’t want to get help from their parents. |
| B．They will part with their friends in a short time. |
| C．They don’t like to be accompanied by their parents. |
| D．They want to be elected by their friends as the Prom King or Queen. |
| A．They can be relieved from the study pressure. |
| B．They are going to say goodbye to their friends. |
| C．They have chances to be elected as the Prom King or Queen. |
| D．The prom marks the graduation and after it they will be independent. |
“I thought it would be a really good experience to go with other friends and teachers to another country in an environment other than a vacation environment,” the 17-year-old girl said.
A few months later, Emily got her chance when she and 14 of her classmates, along with biology teacher Tamara Pennington went to Costa Rica for eight days in late May.
“It was not just a tour,” said Pennington, who organized the trip. “You can go any place in the world on just a tour. This one was really working with the sea turtles (海龟) and practicing conservation(保护). It just seemed like the perfect science field trip for kids who think they want to get into science to see what it"s really like to be out in the field and enjoy themselves.”
Emily said her time on the turtle program, which was the focus of the trip, was “crazy.”“We were walking on the beach at night and you can’t see anything—just see a big black dot.” She said with a laugh. “I was not expecting the turtles to be that big.” The turtles are leatherback turtles, which are becoming extinct (灭绝) because their eggs are used as food.
“When they would move their legs while laying their eggs they were really hard to control because they were a lot more powerful than you would imagine,” Emily said.
Once the eggs were collected, the students took them back to a hatchery(孵化场) and dug holes to copy the hole the mother turtle had made and then buried the eggs for the 60 days needed to hatch.
“The experience was so cool,” Emily said. “You go to another country to see what their culture is like and learn what their everyday lives are like. It made me really want to help out my mom a lot more than I do, and value what I have.”
小题1:What did Pennington consider the trip to be?
| A．It was a common tour to a foreign country. |
| B．It was a journey to practice what students learned. |
| C．It was to attract students’ interest in science. |
| D．It was a trip to do practical science activities. |
| A．she was afraid of walking on the beach at night |
| B．she didn’t dare to catch the powerful turtles |
| C．she had thought turtles were small animals |
| D．she got crazy at the sight of turtles at night |
| A．She learned to be grateful to her teachers. |
| B．She understood the importance of what she had. |
| C．She realized the beauty of foreign culture. |
| D．She knew the importance of everyday life |
| A．Teens Help Fight Turtle Extinction. |
| B．Teens Take a tour to Costa Rica. |
| C．Teens Have a Research on Turtles. |
| D．Teens Learn to be Independent. |
Just plug RichardSolo 1800 into your iPhone once or twice a day, for fifteen minutes, and keep your iPhone charged up. At your desk, or at dinner, plug RichardSolo into iPhone to instantly transfer charge. No more battery worries. RichardSolo will charge iPhone to full 1.5 times, and it is good for 3-5 years of recharges.
Use the iPhone while charging it. Even charge the RichardSolo 1800 and iPhone together at the same time. Take only one charger when traveling and wake up in the morning with the RichardSolo and the iPhone charged.
RichardSolo 1800 is largest in its class and holds its charge for months. Works with almost all iPhone cases.
Your satisfaction is guaranteed, with our 30-day return privilege. If you’re not satisfied for any reason, we’ll email you a pre-paid return label.
Actual customer comments:
To have your company exhibit such good service is unbelievably refreshing. — P.S.
This is what I call great customer support. I wish more companies would figure this out these days. Thank you so much. — D.C.
You have provided me one of the best services I have ever seen on any online/ telephone shopping. — T.K.
You must have the fastest processing and shipping in the industry!! — M.C.
This is the best customer service experience I have had in a long time. — L.L.
I’ve read online about your amazing customer service, and I must say I’m now a true believer. — B.L.
小题1: How long does it take the battery to charge up an iPhone?
| A．15 minutes. | B．30 minutes. | C．1.5 hours. | D．3 hours. |
| A．It is built in an iPhone. | B．It is the smallest of its kind. |
| C．It can also be used as a charger. | D．It keeps power for about 30 days. |
| A．may get your pre-paid money back with any reason |
| B．can demand an apology and the money back within 30 days |
| C．have the privilege of one-month return without any reason |
| D．are probably unable to have the return privilege with a return label |
A. P.S. B. B.L. C. M.C. D. T.K.
小题5:The customer comments on the battery are mainly about its _______.
| A．quality | B．service | C．function | D．shopping |
All students of geography should be able to interpret a weather map accurately.Weather maps contain an enormous amount of information about weather conditions existing at the time of observation over a large geographical area. They reveal in a few minutes what otherwise would take hours to describe. The United States Weather Bureau issues information about approaching storms, floods, frosts and all climatic conditions in general. Twice a month it issues a 30-day"outlook" which is a rough guide to weather conditions likely to occur over broad areas of the United States. These 30-day outlooks are based upon an anaiysis of the upper air levels which often set the stage for development of air masses, fronts and storms.
Considerable effort is being exerted today to achieve more accurate weather
predictions, with identifying and tracking storms over regions which have but few meteorological (气象)stations. Extensive experiments are also in progress for weathef modification studies.
小题1: One characteristic of weather maps NOT mentioned by the author in this passage is_______.
| A．floods | B．fronts | C．temperature changes | D．frosts |
| A．daily weather maps | B．upper air levels |
| C．satellite reports | D．changing fronts |
| A．is modern |
| B．uses electronic instruments |
| C．makes weather prediction easier |
| D．shows things that would otherwise take hours to describe in a few minutes |
| A．sums up a great deal of information | B．appears daily |
| C．shows changing fronts | D．is a science book |
| A．a magazine | B．newspaper | C．a novel | D．a science book |
最新试题
- 1【题文】设，则（ ）A．若B．C．D．
- 2已知，是函数的两个零点，其中常数，，设．（Ⅰ）用，表示，；（Ⅱ）求证：；（Ⅲ）求证：对任意的．
- 3两只羚羊争斗与母鸡保护小鸡的行为的意义在于 （ ）①延续种族 ②减少种群密度 ③保护弱者 ④维持个体生存A．①和②
- 4全集，，，则（ ）A．B．C．D．
- 5现有一包固体粉未，其中可能含有CaCO3、Na2CO3、Na2SO4、NaCl、CuSO4．现进行如下实验：①溶于水得无
- 6.—You couldn’t have bought me any present better.
- 7一个只含有字母a的二次三项式，它的二次项系数，一次项系数均为-3，常数项为1，则这个多项式为______．
- 8【题文】函数f(x)=log2x+2x-1的零点必落在区间（
- 9下列对罗斯福新政的评价，不正确的是[ ]A．使美国经济开始恢复B．从根本上消除了经济危机C．使美国社会趋于稳定D
- 102010年以来，尽管央行几次提高了存款的利率，但国债仍然受到一些人的追捧。这是因为国债 [ ]A．是一种高收
热门考点
- 1（10四川达州16）已知碳酸易分解，草酸与碳酸有相似的化学性质，在受热的条件下草酸也会分解，仅生成三种氧化物。我校研究性
- 2如图所示，一小球从倾角θ为37º的足够长的斜面顶端作平抛运动，初速度为8m/s，A点是小球离斜面最远点。（1）求小球从抛
- 3如图，点O在直线AB上，CO⊥OD，若∠COA=36°，则∠DOB的度数为 [
- 4下面同学对“化学与健康”这一话题发表的见解，正确的是A．“多食用海产品可防治缺铁性贫血”B．“选择食物可调节人体细胞中的
- 5把刻有“pb”的载玻片放在显微镜下观察时，视野中所看到的应当是 A．qbB．ppC．qdD．bp
- 6如图1所示，把铅板和金板压在一起，几年之后，金板上渗入一些铅，铅板上渗入一些金．这是_________现象．如图2所示，
- 7 如图，中，AB=10，BC=6，E、F分别是AD、DC的中点，若EF=7，则四边形EACF的周长是 A．20
- 8如图（甲）所示，两平行金属板间接有如图（乙）所示的随时间变化的电压， 两板间电场可看作是均匀的，且两板外无电场，极板长，
- 9为了估计一个只装有白色棋子的袋子中有多少枚棋子，现在袋中放入40枚黑色棋子，搅均匀后，摸出一枚棋子，记录其颜色，放回后搅
- 10读“某河流区域示意图”，在图中干支流交汇处有一城市。据此回答小题。小题1:有关该河流水文特征的叙述不正确的是A．图中③处