以长为13cm、10cm、5cm、7cm的四条线段中的三条线段为边，可以画

【名词&注释】

多边形(polygon)、对角线(diagonal)、六边形(hexagon)、八边形(octagon)

[单选题]以长为13cm、10cm、5cm、7cm的四条线段中的三条线段为边，可以画出三角形的个数是（ ）(

A. 1个 (
B. 2个 (
C. 3个 (
D. 4个

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学习资料：

[单选题]Mrs King has worked in our school for twenty years． She teaches history here． She often reads(11) when she is free． So she knows much． She has been (12) in China since she left university． Last summer she(13) her two weeks holiday there．She thinks it was one of her(14) holidays and she'll remember it for ever．In a shop next to the museum，Mrs King found an ancient teapot． She liked it very much and bought it． She took good care of it all the time． She often appreciated(欣赏) it at home and wouldn't (15) it to others．

A. Bad luck! She dropped it to the floor and of course，it was broken． She under-stood what it would (16)． She looked at it for a long time． She was very (17) to tell her mother about it． She thought and thought and at last she found (18) ．
B. (19) ，Ann asked，"Do you know what present I:m going to give for your birthday，Mum?"
D. "
E. " ．
F. "
H. letters
I. novels
J. picture-books
K. newspapers

[单选题]一个多边形自一个顶点引对角线把它分割为六个三角形，那么它是（ ）

A. 六边形-
B. 七边形-
C. 八边形^(octagon)-
D. 九边形

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