完形填空，阅读下面的短文，掌握其大意，然后从短文后各题所给的A、B、C、D四个选项中，选择最佳选项。

　　A

　　IQ(intelligence quotient智商)is a score that shows a person’s level of intelligence. People used to believe that some people are born with a high IQ and some aren’t.

　1 a study by scientist at University College London has challenged(挑战)this idea. According to an article last October on the Journal Nature, scientists are beginning to think that our IQ is not a constant(不变的)score.

　　The scientists tested 33 healthy young people in 2004 between the ages of 12 and 16. Then they did tests again four years later, when the same people were between 16 and 20.

　　Scientists found big changes in the IQ scores between 2008 and 2004. Some　2and some fell 3 as many as 21 points.

　　To test whether these scores were meaningful, the scientists compared them with results from brain scans(扫描). They found that the IQ changes matched changes in the structure(结构)of the subjects’ brains. “A change in 20 points is a huge 　4 ,” said Professor Cathy Price, who led the research. He said it could mean the difference between an average and a 　5 person. The team has not found a clear cause for these changes. However, they say it is 　6 that education plays a role in changing IQ. “Here we have shown that children’s 　7 is likely to be still developing, ” says Price. “We have to be careful not to write off 　8 performers at an early stage. In fact, their IQ may improve in a few more years. ”

　  1 A. And B. However C. Besides D. Though

　  2 A. rise B. rose C. raise D. raised

　  3 A. of B. with C. by D. from

　　4 A. difference B. matter C. thing D. meaning

　　5 A. successful B. gifted C. able D. rich

　　6 A. natural B. true C. certain D. possible

　  7 A. score B. intelligence C. skill D. interest

　　8 A. clever B. prettier C. nicer D. poorer

　　B

　　As darkness fell, hundreds of people in the Swiss village left their houses. They were staring(注视)forward at the mountain top in the distance. It was covered with ice and snow-beautiful and dangerous.

　　The huge mountain is called Matterhorn. Mountain climbers had 　9 the top through the southern route(路线). But no one had ever dared to try a winter climbing up the northern side. But now one man was daring to try the 10 route. He was Walter Bonatti, a great mountain climber 　11 Italy. For two days he had climbed. The village people had watched him anxiously(焦虑). Now they were waiting to see his signal. If he planned to 　12 the next day, he would light(点燃)a green signal(信号). A red light would mean that he was turning back. A tiny green light 13 high on the mountain side. Bonatti was not giving up! The people 　14. The next day he continued his way upward. He was so lonely and so 　15 ! But he would not give up. Again that night he lit the green light. In the morning, Bonatti 16 . He could not see the top;he knew he was 17there. Though the climb was painful, he moved up. Bonatti had spent months 　18for the climb. Was the training enough? Did he have the strength and skill to climb to the top? He was finally at the top! News about his. 　19 was radioed to the world.

　　The trip down the southern route was easy. He was warmly welcomed in the village. He had done the “ 　20” and would be well remembered as a climber of all time.

　　 9A. reached B. passed C. watched D. followed

　　10A. comfortable B. important C. difficult D. nervous

　　11 A. with B. from C. in D. at

　　12 A. turn back B. come down C. go on D. get back

13A. placed B. appeared C. pulled D. found

　　14 A. cried B. laughed C. jumped D. cheered

　　15 A. sleepy B. excited C. tired D. happy

　　16 A. woke up B. turned up C. got up D. looked up

　  17 A. already B. almost C. hardly D. surely

　  18A. training B. practising C. planning D. asking

　  19 A. importance B. success C. climb D. courage

　  20A. necessary B. dangerous C. perfect D. impossible

完形填空

　　Vitamins(维生素) are a discovery of this century. A hundred years 1 , no one knew anything 2 them. The vitamins are 3 by letters of alphabet. Vitamin A 4 by the eyes. There is Vitamin A in milk, butter and green vegetables. It 5 by the body.

　　Vitamin B must be supplied (提供) 6 by some of our food. The skins 7 grains of all sorts have Vitamin B in them.

　　Vitamin C is very important 8 the body. Without it 9 teeth will become loose (变松)and their arms and legs become weak. Oranges and tomatoes 10 Vitamin C in them.

　　Vitamin D is 11 called the “sunshine Vitamin”. We can 12 it in milk and eggs. A substance (物质) in the skin can be changed 13 vitamin.

　　There are 14 vitamins. But these A, B, C, D are the 15 important.

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1. 你曾经到过李雷的家吗？?

　　　　  you 　　　　  　　　　  　　　　  Li Lei’s home?

2. 我从前见过，但它们一点也不漂亮。?

I’ve seen them 　　　　 ,but they weren’t beautiful 　　　　  　　　　 .

3. 他们来这里刚十年。?

They 　　　　  　　　　  here 　　　　  just ten years.

4. 保护环境非常重要。?

 　　     　　　　  　　　　  our environment is very important.

5. 那是一种有助于保持我们城市清洁的愉快的方法。?

It’s a 　　　　  　　　　  to help keep our city clean.

6. 我们要努力把大地覆盖上绿树。?

We are trying to 　　　　  the ground 　　　　  green trees.

7. 突然一曲优美的音乐传入我的耳朵。?

　　 　　 a piece of beautiful music 　　　　  　　　　  my ears.

8. 你曾经乱砍伐树木吗？?

Have you ever 　　　　  　　　　  trees?

9. 如果人人都为环境保护做一点贡献，世界会变得更美好。?

If everyone 　　　　  　　　　  　　　　  　　　　  protecting the environment, the world will become much more beautiful.

10. 我一到北京，就给你打电话。?

I’ll call you 　　　　  　　　　  　　　　  I get to Beijing.