单项选择题

Since you have failed three of the last four tests, you cannot afford to be（）about passing for the term.

A. courteous
B. relevant
C. optimistic
D. passive

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单项选择题
Sichuan University has not only (a variety of) departments (but) a large (student body) (consisting in) many people from different countries all over the world（）

A. a variety of
B. but
C. student body
D. consisting in
单项选择题
Changing from solid to liquid, water takes in heat from all substances near it, and this （）produces artificial cold surrounding it.

A. absorption
B. transition
C. consumption
D. interaction
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