单项选择题

Medical research has shown that the widespread use of cigarettes contributes（）the increase of cancers.

A. towards
B. for
C. with
D. to

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单项选择题
I don't think it advisable that Tom ______ to the job since he has no experience.
A. is assigned
B. will be assigned
C. be assigned
D. has been assigned
单项选择题
（）, it is quite easy to drill a hole in it with laser.

A. Hard although a diamond is
B. As a diamond is hard
C. Hard as a diamond is
D. How hard is a diamond
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