单项选择题
21()
A.are
B.were
C.is
D.was
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单项选择题
22()
A.an end
B.a close
C.a result
D.an outcome
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单项选择题
Lightning is a ______ of electrical current from a el6ud to the ground or from one cloud to another.
A.rush
B.rainbow
C.race
D.rubber
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