单项选择题

Just as a force is required to change the speed of an object, ______ a force must act to cause a change in the direction of the motion.

A. as
B. thus
C. so
D. like
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单项选择题
His answer was so confused that I could hardly make any ______ of it at all.
A. explanation
B. meaning
C. sense
D. interpretation
单项选择题
The United States Constitution provides for a count of the population ______ a census, every ten years.
A. called
B. which called
C. that it is called
D. as called
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