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

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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

单项选择题

Hydrogen is the fundamental element of the universe ______ it provides the building blocks from which the other elements are produced.

A. so that
B. but that
C. in that
D. provided that

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