题目内容

Why can the hummingbird can hover and even fly backwards？

A. Because its wings are large enough.
Because it can tilt its body.
C. Because it has whirling and horizontal blades like a helicopter.
D. Because it can produce down-draft of air by beating their wings very fast

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Experts suggest that speech stages are reached in fixed sequence and at a constant age, but there are cases where speech has started late in a child who______turns out to be of high IQ.

A. eventually
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C. decidedly
D. inversely

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A. flapped
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A. imminent
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C. emergent
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The man didn't know her wife's e-mail address for sure.

A. Right
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C. Doesn't say