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【单选题】

— What's twenty and four? — _____________. [     ]

A.
Twenty-two
B.
Twenty-four
C.
Six
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参考解析:
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举一反三

【单选题】Q: The author cites Mr. Smith’s survey in order to show that ________.

A.
most immigrants are either highly skilled or poorly unskilled
B.
immigrants are mostly those who received little education before arrival
C.
immigrants take up a larger proportion of American population than the natives
D.
there are more highly-skilled immigrants in America than unskilled immigrants

【单选题】铝合金的人工时效温度一般为( )。

A.
低于250℃
B.
250~300℃
C.
300~350℃
D.
高于350℃