单项选择题

If we continue to ignore the issue of global warming, we will almost certainly suffer the（）effects of climatic changes worldwide.

A. dubious
B. drastic
C. trivial
D. toxic

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单项选择题
A new technique（），the yields as a whole increased by 20 percent.

A. working out
B. having worked out
C. having been worked out
D. to have been worked out
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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