完形填空（共15小题；每小题2分，满分30分）
阅读下面短文，掌握其大意，然后从下列各题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。
The human nose is an underestimated tool. Humans are often thought to be  1___ smellers compared with animals, but this is largely because, unlike animals, we stand upright. This means that our noses are  2 to detecting those smells which float through the air,  3  the majority of smells which stick to surfaces. In fact though, we are extremely sensitive to smells, even if we do not generally realize it. Our noses are capable of  4 human smells even when these are  5  to far below one part in one million.
　　  6    , some people find that they can smell one type of flower but not another, while others are sensitive to the smells of both flowers. This may be because some people do not have the genes necessary to generate  7    smell receptors in the nose. These receptors are the cells which sense smells and send  8   to the brain. However, it has been found that even people insensitive to a certain smell at first can suddenly become sensitive to it when  9    to it often enough.
　　The  10  for insensitivity to smell seems to be that brain finds it  11   to keep all smell receptors working all the time but can  12  new receptors if necessary. This may also explain why we are not usually sensitive to our own smells we simply do not need to be. We are not  13    of the usual smell of our own house but we  14    new smells when we visit someone else's. The brain finds it best to keep smell receptors _ 15   for unfamiliar and emergency signals such as the smell of smoke, which might indicate the danger of fire.

Be calm, Madam, can you remember _______ you had your mobile phone stolen?

A. when was it that　　　　　　　　　　　　　　　　　 B. that it was when

C. where it was that　　　　　　　　　　　　　　　　 D. it was where that

Thomas Alva Edison was awarded more patents on inventions than any other American.When he died in 1931，Americans wondered how they could best show their respect for him.One suggestion was that the nation observe a minute or two of total blackout.All electric power would be shut off in homes，streets，and factories.Perhaps this suggested plan made Americans realize fully what Edison and his inventions mean to them.Electric power was too important to the country.Shutting it off for even a short time would have led to complete confusion.A blackout was out of the question.

　 On the day of Edison’s funeral，many people silently dimmed their lights.In this way they honored the man who had done more than anyone else to put the great force of electricity at his countrymen’s fingertips.

1.This selection says that Thomas Edison　　　　 .

　 A.was the only important American inventor

　 B.received the first American patent

　 C.received more patents than any other American

　 D.was the first American inventor

2.People decided to honor Edison when　　　　 .

　 A.he made the first electric light

　 B.electric power was 100 years

　 C.the country realized electricity’s importance

　 D.he died in 1931

3.The suggested plan was to　　　　 .

　 A.turn off the lights in factories and schools

　 B.observe a few minutes of total silence

　 C.dim all electric lights

　 D.shut off all electricity for a short time

4.Americans fully realized what Edison’s inventions meant when they　　　　 .

　 A.heard of his death

　 B.heard of the plan to honor him

　 C.first used electric power

　 D.tried to carry out the plan

5.The plan was never carried out because　　　　 .

　 A.not everyone wanted to honor Edison

　 B.it was too difficult

　 C.electric power was too important to the country

　 D.it honored only one of Edison’s inventions

Good advice is like medicine for the soul. What kind of 1　 have you recently received? Who do you go to got advice? Do you have a mentor(顾问)? A mentor is a　 2　 adviser.
　 Parents, teacher and friends are often great 　 3 .Sports figures, public officials can also be good 　4　 of mentors, but a person with whim you are a personal relationship will most likely be able to 　5 you the best advice.
　 Mentors teach things that seem to be 　6　 sense. Proverbs are wise old sayings that are common in every language and　 7　 , and can sometimes be　 8 for a nonnative to understand. For example, all that　 9　 is not gold(some things are not as 　　10 as they appear ).
　 Advice 11 in newspapers and magazines are another way to 12　 advice.
　 Talk shows on radio and television are also very popular. Americans and Canadians love to 　　 13　 themselves. Many people are not　 14 to ask for help or　 15 about a problem in order to receive advice. People generally will 16　 their own experience to 17 their friends. Overcoming a difficult situation is 18　 respecter in North America. People love to heat motivational (积极的) stories and 19　 . One proverb, a friend in need is a friend indeed, shares the concept that a true friend will help you out in times of 　 20　 .

1. A. success　　　　 　　　 　　　 B. measure　　　 　　　　　 C. position　　　　 　　　 D. advice

2. A. devoted　　　 　　　 B. united　　　　　 　　　　 C. trusted　　　　　 　　　　 D. expected

3. A. interviewers　 　　 B. mentors　　　　 　　　　　 C. followers　　　 　　　　　 D. competitors

4. A. examples　　　 　　　 B. mentors　　　　 　　　　　 C. manners　　　 　　　　　 D. services

5. A. consider　　　 　　　 B. exchange　　　 　　　　　　 C. adapt　　　　　 　　　　 D. offer

6. A. present　　　　 　　　 B. attractive　　　 　 　　　 C. common　　　 　　　　　 D. particular

7. A. experience　 　　 　　　 B. difference　　　 　　 　　　 C. culture　　　　　 　　　　 D. behavior

8. A. simple　　　　　 　　 　　　 B. difficult　　　　 　 　　　 C. natural　　　　　 　　　 　　　 D. brief

9. A. glitters B. packages C. acts D. forces

10. A. different　　　 B. negative　　　　 　 　　　 C. primary　　　　 　　　　　 D. valuable

11. A. columns　　 　 　　　 B. materials　　　　 　 　　　 C. wonders　　　 　　　　　 D. add

12. A. reduce　　　 　　　 B. add　　　　　　　 　　　　　 C. keep　　　　　　 　　　　　　 D. get

13. A. enjoy　　　　 　　　 B. teacher　　　　　 　　　 C. express　　　　 　　　　 D. defeat

14. A. brave　　　　 　　　 B. afraid　　　　　　 　　 　　　 C. honest　　　　　 　　　 D. lucky

15. A. talk　　　　　 　　　 　　　 B bring.　　　　　　　 　　 　　　 C. care　　　　　　　 　　　　　　 D. look

16. A. remind　　　　 　　　 B. suggest　　　　 　　　　 C. clone　　　　　 　　　　　 D. share

17. A. lead to　　　　 　　　 B. set free　　　　 　　　　 C. help out　　 　　　　 D. take over　　　　

18. A. originally　　 B. highly　　　　　 　　　　 C. equally　　　 　　　　　　 D. closely　　　

19. A. encouragementB. sadness　 　　　　 　　　 C. movement　 　　　　 D. adventure　　　

20. A. happiness　 　　 　　　 B. trouble　　　　　 　　　　 C. excitement　 　　　　 D. nature