单项选择题

The DNA test, together with other tests, () the prisoner's innocence.

A. proves
B. prove
C. proving
D. have proved

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单项选择题

What is the author’s attitude towards trivial educational research().

A. It should not be paid attention to by professors.
B. It can be looked down upon by competent professors.
C. It does not have the same duties with competent research.
D. It does not need improvement.

单项选择题

The word cover (Line 3, Para. 3) is closest in meaning to().

A. refuse
B. insure
C. sell
D. help