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.
上一页 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] ... 下一页 >>
责任编辑：虫虫
您现在的位置：