问题
选择题
下列几何体中不是多面体的是( )
A.立方体
B.长方体
C.三棱锥
D.圆柱
答案
A、立方体有6个平面,故是多面体;
B、长方体有6个平面,故是多面体;
C、三棱锥有四个平面,故是多面体;
D、圆柱有三个面,一个曲面两个平面,故不是多面体.
故选D.
下列几何体中不是多面体的是( )
A.立方体
B.长方体
C.三棱锥
D.圆柱
A、立方体有6个平面,故是多面体;
B、长方体有6个平面,故是多面体;
C、三棱锥有四个平面,故是多面体;
D、圆柱有三个面,一个曲面两个平面,故不是多面体.
故选D.
根据对话内容,从方框内五个选项中,选出能填入空白处的最佳选项
B:I’m looking for a present for my friend, Dave. A:Oh just a moment. There are some toys over there . __2_ _. Do you like them? B:Yes. I think they are really beautiful. But I want to buy some books. _3_. A:Please come here. There are some picture books and story books. They are very interesting. B:___4__ A:They’re 20 yuan. B:____5____. |