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A. velocity
B. energy
C. pace
D. speed

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简述税收差别理论的基本内容。

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A. affect
B. judge
C. lead
D. study

The last paragraph suggests that future robots will be___________.

A. more humanlike in behavior. and actions.
B. more like automatic machines.
C. better able to move on inclines.
D. better equipped with laser light sensors.

Some environmentalists think that __________. 查看材料

A. plastic packaging should be made more convenient
B. no alternative can be found to plastic packaging
C. too much plastic is wasted
D. shops should stop using plastic containers

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