单项选择题

Living in the central Australian desert has its problems, ________ obtaining water is not the least.

A. of which
B. for what
C. as
D. whose
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单项选择题
Lincoln, Nebraska, is an important manufacturing, insurance, and _______ center.
A. shipping of grain
B. to ship grain
C. grain was shipped
D. grain-shipping
单项选择题
There ought to be less anxiety over the perceived risk of getting cancer than ______ in the public mind today.
A. exists
B. exist
C. existing
D. existed
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