单项选择题

After briefly ______ the history of the author, Prof. Li turtles to the novel itself immediately.

A. dipping in
B. dipping at
C. dipping into
D. dipping to
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Features such as height, weight, and skin color ______ from individual to individual and from face to face.
A. vary
B. change
C. alter
D. convert
单项选择题
______ for your help, we' d never have been able to get over the difficulties.
A. Had it not
B. If it were not
C. Had it not been
D. If we had not been
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