单项选择题

Cancer is second only ______ heart disease as a cause of death.

A. of
B. to
C. with
D. from
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单项选择题
It is necessary that we ______ have a good command of English at college.
A. must
B. have to
C. should
D. ought to
单项选择题
It is difficult for us to explain phenomena that we have little or ______ direct knowledge.
A. no any
B. no
C. none
D. nothing
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