单项选择题

Because of the lasting pain, he could hardly walk on his own () do any housework.

A. and
B. nor
C. also
D. or

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单项选择题

Pupils may go on and reach certain broad and () understandings which are the final objectives of education itself.

A. strict
B. narrow
C. vague
D. general

单项选择题

According to the passage, crows and rooks ().

A. are the same kind of birds with different names
B. are very different in behavior
C. had the same name in the past
D. were both used in the experiments