21.［A］They have difficulty identifying these cells。
［B］They aren’t sure how these cells work。
［C］They’ve learned how to reproduce these cells。
［D］They’ve found similar cells in other species。
22.［A］To learn how to prevent a bone disease。
［B］To understand differences between bone tissue and other tissue。
［C］To find out how specialized bone cells have evolved。
［D］To create artificial bone tissue。
Questions 23 to 25 are based on the conversation you have just heard。
19.［A］Two different types of bones in the human body。
［B］How bones help the body move。
［C］How bones continuously repair themselves。
［D］The chemical composition of human bones。
20.［A］They defend the bone against viruses。
［B］They prevent oxygen from entering the bone。
［C］They break down bone tissue。
［D］They connect the bone to muscle tissue。
21.［A］They have difficulty identifying these cells。
［B］They aren’t sure how these cells work。
［C］They’ve learned how to reproduce these cells。
［D］They’ve found similar cells in other species。
22.［A］To learn how to prevent a bone disease。
［B］To understand differences between bone tissue and other tissue。
［C］To find out how specialized bone cells have evolved。
［D］To create artificial bone tissue。
Questions 23 to 25 are based on the conversation you have just heard。
23.［A］A new fuel for buses。
［B］The causes of air pollution。
［C］A way to improve fuel efficiency in buses。
［D］Careers in environmental engineering。
24.［A］Her car is being repaired。
［B］She wants to help reduce pollution。
［C］Parking is difficult in the city。
［D］The cost of fuel has increased。
25.［A］A fuel that burns cleanly。
［B］An oil additive that helps cool engines。
［C］A material from which filters are made。
［D］An insulating material sprayed on engine parts。
Section B
Directions:In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked ［A］, ［B］, ［C］and ［D］.Then mark the corresponding letter on Answer Sheet 2 with a single line through the centre。
Passage One
Questions 26 to 28 are based on the passage you have just heard。
26.［A］From three to five months。
［B］Three months。
［C］Five months。
［D］Four months。
27.［A］Watch traffic。
［B］Obey commands。
［C］Cross streets safely。
［D］Guard the door。
28.［A］Three weeks。
［B］Two weeks。
［C］Four weeks。
［D］Five weeks。
Passage Two
Questions 29 to 31 are based on the passage you have just heard。
29.［A］Two to four times。
［B］Four to six times。
［C］Four to eight times。
［D］Six to ten times。
30.［A］Sleeping pills made people go into REM sleep quickly。
［B］People had more dreams after they took sleeping pills。
［C］People became angry easily because they didn’t take sleeping pills。
［D］Sleeping pills prevented people from going into REM sleep。
31.［A］People dream so as to sleep better。
［B］People dream in order not to go into REM sleep。
［C］Because they may run into difficult problems in their dreams。
［D］Because in their dreams they may find the answers to their problems。
Passage Three
Questions 32 to 35 are based on the passage you have just heard。
32.［A］A sales representative。
［B］A store manager。
［C］A committee chairperson。
［D］A class president。
33.［A］To determine who will graduate this year。
［B］To discuss the seating arrangement。
［C］To choose the chairperson of the ceremonies。
［D］To begin planning the graduation ceremonies。
34.［A］Their names, phone numbers and job preference。
［B］The names and addresses of their guests。
［C］The names of the committee they worked on last year。
［D］Their dormitory name, address and phone number。
35.［A］In an hour。
［B］Next week。
［C］In one month。
［D］Next year。
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