单项选择题

The United States and Canada have agreed ________in regard to the Great Lakes.

A．to eliminate swimming entirely
B．to limit boating and fishing
C．to limit phosphates and detergents
D．to kill all algae
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单项选择题
In order to persuade the professor to help her, the woman says that________.
A．she is unusually well prepared
B．she wants to take an easy course
C．she needs additional credits in the subject
D．she wants to read a book in this field
单项选择题
The woman is________.
A．a junior
B．a senior
C．a graduate student
D．a teaching assistant
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