单项选择题

The role of trees is to______.

A．loose soil
B．keep soil in position
C．harden soil
D．Both A and B
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单项选择题
What is the professor’s first reply to the woman’s request
A．He doesn’t intend to offer the course.
B．He doesn’t think the course will interest her.
C．He never accepts under-graduates in his course.
D．He thinks the course will be too difficult for her.
单项选择题
Which tourist attraction is NOT mentioned in the dialogue
A．Buckingham Palace.
B．Shops and restaurants.
C．Tower of London.
D．The British Museum.
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