( )Mother warned__________the electric lamp.

( )Mother warned__________the electric lamp. A.not to touch B.him not to touch C

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Mac and Dick managed all of the following businesses except

Mac and Dick managed all of the following businesses except __________( )A.a dri

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第25题应填入( )

第25题应填入( )A.long B.longer C.happy D.lucky

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( )Mr. Baker sent his son to the doctor__________a check.

( )Mr. Baker sent his son to the doctor__________a check. A.gives B.to give C.be

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若双曲线的两准线间的距离等于它的半焦距,则双曲线的离心率为

若双曲线的两准线间的距离等于它的半焦距,则双曲线的离心率为 A. B.2 C.1 D.以上都不对

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