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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单项选择题
（）is the center of our planetary system was a difficult concept to grasp in the Middle Ages.

A. It is the sun and not the earth
B. Being the sun and not the earth
C. The sun and not the earth
D. That the sun and not the earth
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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