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问题 选择题

已知四棱锥P-ABCD的底面是边长为6的正方形，侧棱PA⊥底面ABCD，且PA=8，则该四棱锥的体积是（　　）

A．288

B．96

C．48

D．144

答案

∵PA⊥平面ABCD，

∴VP-ABCD=

1
3
S正方形ABCD•PA

=

1
3
×62×8=96

即四棱锥P-ABCD的体积为96．

故选B．

听力题

根据下列句子及所给汉语注释，写出空缺处各单词的正确形式(每空只写一词)

小题1:The standard                (键盘)of the computer has just over 100 keys.   

小题2:Most matter has three states: solid,           (液态)and gas.  

小题3:She was the teacher who taught us English         (文学) .  

小题4:The third season of a year is          (秋季).  

小题5:He is very ill and needs an              (手术).  

小题6:This bus is large enough to carry 60           (旅客).

小题7:You can click on this       （按钮）to return to a page that you saw earlier.

小题8:Her brother has just received his graduation           (证书).  

小题9:Mary was always coming up with new ways to attract            （顾客）.

小题10:The stars are shining like           (钻石)in the sky .
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判断题

报检进口旧机电产品时，须提供国家环境保护总局签发的《进口废物批准证书》。 ( )
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