下列命题是假命题的是 A．三角形的内角和是180 ° B．多

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问题选择题

下列命题是假命题的是

A．三角形的内角和是180 °

B．多边形的外角和都等于360°

C．五边形的内角和是900°

D．三角形的一个外角等于和它不相邻的两个内角的和

答案

答案：C

本题考查多边形的角度问题。多边形的内角和为180°（n-2）,故C不正确。

填空题

根据对话内容，完成下面短文，使其意思完整，首字母已给出。

Bill: We'll have a school concert this Sunday. I can only play the drums.

Mike: l can play the piano and the guitar, but I can't sing. Who can sing?

Jack: I can sing and dance, and I can also play the violin.

Bill: OK, the concert will begin at 8:00 p. m. We must get to the school auditorium at 4:00 p. m.

Mike and Jack: OK, bye.

Bill, Mike and Jack are talking about the school (1) c______. Jack can sing and (2) d______ and he can

also play the (3) v______. Mike can't (4) s______well, but he can play the (5) p______ and the (6) g______.

Bill can (7) o______ play the (8) d______. He asks them to get to the school (9) a______ 4:00 p.m. The

(10) c______ will begin at 8:00 p.m.

问答题简答题

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