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问题 填空题

计算：(－3)100×(－3)－99＝          ；20112－2010×2012＝          .

答案

－3；1      

(－3)100×(－3)－99＝；

20112－2010×2012＝=1.

选择题

The house rent is expensive.I’ve got about half the space I had at home and I’m paying________here.

A．as three times much

B．as much three times

C．much as three times

D．three times as much
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选择题

下列物质中，既有离子键又有共价键的是（   ）

A  Ca(NO3)2        B .  KOH         C.  H2O         D.  NH4F
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