单项选择题

A．Physics.
B．Mathematics.
C．Environmental science.
D．Life science.

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单项选择题
A. He should try a better and convenient way. B. He should give up looking for the book. C. He should ask the librarian for help. D. He should try the shelves downstairs.

A. He should try a better and convenient way.
B. He should give up looking for the book.
C. He should ask the librarian for help.
D. He should try the shelves downstairs.
填空题
Some thriving institutions are also threatened because of （）.
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