单项选择题

Darkness doesn't trouble cats, for they can see ______.

A. in dark
B. in the dark
C. in a darkness
D. in darkness
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单项选择题
______ work has been done to improve people' s living standard.
A. Many
B. A great many
C. A large number of
D. A great deal of
单项选择题
If you want to become a doctor, you ought to study ______.
A. medicine
B. the medicine
C. literature
D. the literature
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