题目内容

A．inB．atC．forD．by

A. in
B. at
C. for
D. by

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A. oneself
B. yourself
C. myself
D. ourselves

A. has been recognized
B. is paid little attention to
C. is accepted on the base of scientific proof
D. is still unknown

A. looks
B. needs
C. puts
D. finds

A. to extent
B. to some extent
C. to the extent
D. to an extent