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
When did Mr. Tim go to see the plot chosen by his son
A．Last Friday.
B．Last Saturday.
C．Two days ago.
D．Yesterday.
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