题目
题型:不详难度:来源:
An apple a day may keep aging away.
The research chose fruit flies(果蝇), as they share many genes(基因)with humans. The fruit flies were either fed normally or had an apple extract(浓缩物) added to their diet.
It turned out that those fruit flies that were given apple extract lived about 55 days—five days longer than the flies that were normally fed. The research group also found it easier for the flies to walk,climb and move about as they aged.
According to the result, the researchers believed that the antioxidants(抗氧化剂) in the apple extract helped clean up dangerous chemicals(化学物质) that cause illnesses,as well as aging.
In another study,researchers examined diets of thousands of women. They discovered that those who regularly ate apples were 20 percent less likely to suffer heart illnesses and stroke.
The apples’ genetic code(遗传密码) was discovered recently. It allows scientists to develop nicer and healthier fruits. Researchers are already using the information to grow a kind of apples full of antioxidants that can keep eyes and joints healthy and protect humans against heart illnesses and cancer.
Apples that kill the desire(***) to eat could also be produced, with the first“extra-healthy’’apples on supermarket shelves within just four or five years.
The team that keeps studying apple DNA includes 100 scientists from five countries. Their research also suggests that around 65 million years ago, when dinosaurs began to die off the plant,which would finally become today’s apple tree, experienced a great genetic change. The number of many of its genes doubled. The extra genes allowed the apple to get used to worse conditions and go through a different development from peaches,strawberries and other related fruits.
小题1:Why were fruit flies used for the research?
A.Because they have a similar diet to humans. |
B.Because they have a history as long as apples. |
C.Because they share a lot of genes with humans. |
D.Because they feed on nothing but apple extract. |
A.Apples produce chemicals that can change human genes. |
B.Apples have antioxidants that kill chemicals that cause aging. |
C.Apples are rich in vitamins that are needed in humans’bodies. |
D.Apples produce chemicals that make apples taste more delicious. |
A.Their genes stopped their development as the environment got worse. |
B.Their genes became twice in number but they finally died off like dinosaurs. |
C.They experienced a great genetic change making them used to worse conditions. |
D.They went through a similar development to peaches, strawberries and other related fruits. |
A.Eating apples may bring us more advantages than we might believe before. |
B.People who have the habit of eating apples don’t need to see a doctor. |
C.Apples that kill the desire to eat are already available in supermarkets now. |
D.People will eat apples instead of peaches and strawberries from now on. |
答案
小题1:C
小题1:B
小题1:C
小题1:A
解析
小题1:The research chose fruit flies(果蝇), as they share many genes(基因)with humans.可以看出。
小题1:根据“According to the result, the researchers believed that the antioxidants(抗氧化剂) in the apple extract helped clean up dangerous chemicals(化学物质) that cause illnesses,as well as aging.”
小题1:根据“when dinosaurs began to die off the plant,which would finally become today’s apple tree, experienced a great genetic change.”
小题1:吃苹果会给我们带来更多的优点比我们可能相信之前。
核心考点
试题【You are probably familiar with the saying:An apple a day keeps the doctor away. 】;主要考察你对科普环保类等知识点的理解。[详细]
举一反三
I was afraid Dad would be 40 and never let me drive again, so I drove back quickly to meet Dad and made an excuse(借口) 41 my being late. I’ll never forget the cry he gave me: “I’m disappointed that I feel you have to tell a lie to me, Jack. I’m angry, not with 42 but with myself. I have failed 43 I’ve brought up a son who can not even tell the truth to his own father. I’m going to walk home now and think seriously about 44 I have done wrong all these years.”
Dad began 45 along the road. I begged(乞求)all the way, telling him how I drove behind him for 40 miles, at a speed of 5 miles an hour. It was the most unforgettable lesson. I have never told a lie to him ever since.
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A minute passed, and another, 48 the teacher didn"t appear. We began to wonder what was the matter with her. Was she ill? Or had she forgotten about the class? 49 could tell. Soon some students began to study other subjects, some students began to talk and even made 50 .
About ten minutes later, the door opened and Miss Liu 51 came in, smiling. She didn"t say sorry to the class. We felt 52 angry. The teacher often told us never to be late for class and said it was 53 manners to be late. She also said that if we were late, we should make an apology (道歉) 54 at once or after class. But now she was late and had kept the whole class waiting for such a long time and didn"t even tell us the reason. It was unfair. At this moment, Miss Liu picked up a piece of chalk(粉笔) and 55 "Teacher IsLate" on the blackboard and said that was the topic of our composition today. All of us smiled and understood what the teacher meant.
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You should not keep your eyes 39 for a long time. When reading, you should keep the books about a foot away from you. After reading for an hour 40 two, you "d better have a 41 by looking into the distance(远处).
You must remember not to read in dark light or in 42, not to read on a moving bus or in bed. Doing eye exercises will help 43 to protect your eyesight.
In a 44 , to keep 45 eyesight, we must have good studying habits.
小题1:A.importance | B. experience | C. difference |
小题2:A. So | B. Because | C. But |
小题3: A. what to | B. how to | C. when to |
小题4: A. working | B. walking | C. waking |
小题5:A. and | B. or | C. as |
小题6:A. talk | B. rest | C. by |
小题7:A. the earth | B. the star | C. the sun |
小题8:A. him | B. us | C. you |
小题9:A. word | B. sentence | C. letter |
小题10: A. bad | B. good | C. weak |
Now lots of teenagers like smoking. It"s a big problem. Some of them smoke, just for fun and some think smoking looks cool. Others smoke because there are many people around them that smoke.
As we all know, smoking is harmful, especially to students. Some teenagers even steal money so that they can buy cigarettes. Besides, smoking does harm to brains and it can influence studies. Finally, it is bad for health because it can cause diseases.
Therefore(因此), we should protect ourselves from smoking. First, we should learn more about the danger of smoking. Second, we should keep away from people who smoke.
小题1:Now some teenagers like smoking because_________.
A. smoking is good for them
B. their parents want them to do so
C. they think it is fun
小题2:From the passage, we know some teenagers steal money in order to _______.
A. buy cigarettes B. buy books C. play games
小题3:Smoking is harmful to_________ .
A. brains B. legs C. eyes
小题4:Which of the following sentences is NOT true?
A. Smoking can cause diseases.
B. Smoking can influence studies.
C. We shouldn"t keep away from people who smoke.
小题5:The writer of the passage wants teenagers________.
A. to smoke B. not to smoke C. not to keep away from smoking
小题1: Children can go to school at the age of four in the U.S.
小题2:Most parents prefer to send their children to private schools in America.
小题3:About fifty percent of high school students can go on to universities after they leave the secondary school today.
小题4:Lots of American students go to universities by depending on their parents completely (完全地).
小题5:The passage is mainly about American education.
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