单项选择题
A result of nuclear explosion,fallout is the descent of
minute
particles of radioactive materiaI through the atmosphere.
A．charged
B．heavy
C．tiny
D．lost
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单项选择题
Columbus discovered America while seeking a trade route to Indi
A． mappingB. hoping forC. searching forD. finding
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单项选择题
Color changes in chameleons seem to be caused by environmental temperature as well as by other external stimuli.
A．ought
B．have
C．appear
D．used
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