27. Exploring _____space is exciting, yet dangerous.

　　 There is _____need for both robots and humans for space exploration.

　　 A. the; a　　　　　 B. a; a　　 　　 　　 C. /; a　　　　　　 D. /; the

26. Life is like time. Once _____, it never returns.

　　 A. to lose　　　　　 B. loving　　　　　　　　 C. lost　　　　　　 D. being lost

25. The company gave away 300 dictionaries to the students at the beginning of the term, and _____500 the next term.

A. more　　　　　　 B. another　　　　　　　 C. other　　　　　 D. further

24. While many believe Benjamin Franklin to have discovered electricity, recent findings seem to show _____.

A. anyway　　　　 B. otherwise　　　　　 C. somehow　　　　　 D. so

23. - Can I smoke in this hall?

- No, you can’t. If you _____, please go to the smoking room.

A. should　　　　　 B. might　　　　 　 C. can　　　　　　　 　　　 D. must

22. - I’m terribly sorry to have put you through so much trouble.

　 - _____. I know you didn’t mean to.

A. Forget about it　　　　　　 B. No trouble　　　　 C. All right　　　　　　 D. You’re welcome

21. - He seems to be lost in thought. Why?

- Because the film _____his memories of his childhood.

A. calls up　　　　　　　 　　 B. picks up　　 　　　 C. brings up　　　　　 D. takes up

1. What do we know about the restaurant?

A. It’s now the man’s favorite one.　　　　　 B. It’s now the woman’s favorite one.

C. Its food is not as good as before

2. Where are the woman’s keys?

A. In the pocket of her coat.　　　　　　　　　 B. In the man’s room　　　　　　 C. In her handbag.

3. What is the total cost of the tickets?

A. 1,200 yuan　　　　　　　　　 B. 600 yuan　　　　　　　　　 C. 1,800 yuan

4. What does the woman want?

A. A book about geography.　 B. A book about traveling.　 C. A book with the white cover.

5. What does the woman most probably do?

A. A clerk.　　　　　　　　　　　　 B. A waitress.　　　　　　　　　　　 C. A salesgirl.

6. What is the woman’s problem?

A. She is hurt during the X-ray examination.　　　　　 B. There is something wrong with her lungs.

C. She catches a cold and coughs heavily.

7. When will the woman get the results?

A. Two hours later.　　　　　 B. Three hours later.　　　　　　 C. Before she leaves the hospital.

8. How long haven’t the speakers seen each other?

A. About forty years.　　　　 B. About fourteen years.　　　　 C. About four years.

9. How did the woman find the man?

A. The man’s brother told her.　 B. Her brother told her.　 C. The man wrote a letter to tell her.

10. Why does the woman visit the man?

A. She wants to send a letter to the man.　　　　　　　　 B. She intends to stay at the man’s home.

C. She wants the man to know she is in town.

11. Why does the woman have to put off the meeting?

A. She couldn’t get in touch with her cousin.　　　　 B. She has to attend an important party.

C. Her plane has been delayed because of the fog.

12. What does the woman ask the man to do?

A. To find her cousin’s address.　　　　　　 B. To send her cousin a message.　　　　

C. To attend her cousin’s party.

13. What are they going to do on Thursday?

A. Visit the woman’s cousin.　　　　　 B. Attend John Brown’s party.　　　　　　 C. Have a conference.

14. What are the two speakers talking about?

A. The weekend plan.　　　　　　　　　　 B. The travel schedule.　　　　　　　　　　　　 C. Their hobbies.

15. What is the possible relationship between the two speakers?

A. Father and daughter.　　　　　　　　　 B. Friends.　　　　　　　　　　 C. Husband and wife.

16. What does the woman like best?

　A. Playing football.　　　　　　　　　　　 B. Climbing mountains.　　　　　　　　　　　 C. Singing songs.

17. What do they decide to do in the end?

A. Have a get-together.　　　　　　　　　 B. Climbing mountains.　　　　　　　　 C. have a picnic.

18. Why is an earthworm(蚯蚓) useful?

A. It is a very hard-working animal.　　　　　　　　　　 B. It digs tunnels.　　　　　 C. It makes the soil rich.

19. What will happen to the plant material dragged underground by earthworms?

A. Remaining fresh.　　　　　　　　 B. Becoming dry.　　　　　　　　　 C. Becoming rotten.

20. How much soil can 50,000 earthworms carry to the surface of an acre of land in a year?

A.8 tons　　　　　 　　　 B. 18 tons　　　 　　　 　　　 C. 80 tons

20．(黄浦二)设阿伏加德罗常数的数值为N_A，下列说法正确的是(　　 )

A．常温常压下，1 mol氦气含有的核外电子数为4 N_A　　　

B．常温常压下，62g白磷分子(　　　 )中的共价键数目为3 N_A

C．标准状况下，11.2L以任意比例混合的氮气和氧气所含的原子数为N_A

D．标准状况下，N_A个NO分子和0.5 N_A个O₂分子混合后气体的总体积为33.6 L

12、(闸北二)设N_A为阿伏加德罗常数，下列说法正确的是(　　 )

A．由²H和¹⁸O所组成的水11 g，其中所含的中子数为4N_A

B．常温常压下的33．6L氯气与27g铝充分反应，转移电子数为3N_A

C．标准状况下，1L乙醇完全燃烧产生CO₂分子的数目为N_A /11．2

D．0.1 mol H₃O⁺中含有的电子数为N_A