13.[A]Before six.
[B]At six.
[C]After six.
[D]After seven.
14.[A]It is bigger.
[B]It is of a prettier color.
[C]It has a larger yard.
[D]It is brighter.
15.[A]Australian and American.
[B]Guest and host.
[C]Husband and wife.
[D]Professor and student.
16.[A]1∶30
[B]11∶00
[C]9∶30
[D]10∶00
17.[A]He prefers staying at home because the bus is too late.
[B]He prefers staying at home because he doesn’t like to travel.
[C]He prefers taking a bus because the plane makes him nervous.
[D]He prefers traveling with the woman.
18.[A]He thinks she should visit her cousin.
[B]Her cousin doesn’t visit very often.
[C]Her cousin is feeling a lot better today.
[D]He doesn’t think her cousin has been at home today.
Questions 19 to 22 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.
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