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
单项选择题
Hens laying eggs need plenty of nourishing food.
A．eat
B．require
C．find
D．use
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