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.