问题
单项选择题
There is one suggestion that the footsteps of crowds walking the streets in major cities could （） energy.
A.assemble
B.gather
C.generate
D.yield
答案
参考答案：C
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There is one suggestion that the footsteps of crowds walking the streets in major cities could （） energy.
A.assemble
B.gather
C.generate
D.yield
参考答案：C