单项选择题

As 4 to 8, ______ 8 is to 16.

A. as
B. so
C. that
D. which
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单项选择题
If negotiations for the new trade agreements take ______ critical food shortages will develop in several countries.
A. too much longer
B. much long too
C. too many longer
D. much too long
单项选择题
Too much ______ to X-rays can cause skin burns, cancer or other damage to the body.
A. disclosure
B. exhibition
C. contact
D. exposure
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