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如图所示,平行四边形abcd的对角线AC,BD交与于点O,E,F在AC上,G,H在BD上,AF=CE,BH=DG证：CG∥HE
数学
用方框中所给的短语完成下列句子或对话so that,thousands of ,be able to ,take part in,according to,take it easy,hold on to,on the other hand,in the future,
英语
s soon as poss
He met her at a party.She was outstanding many guys were after her ,but no one paid attention to h
英语
下列符号中,既表示一种元素,又表示一个原子,还能表示一种物质的是A.H B.H2 C.He D.H2O
化学
下列符号可以表示一种物质、一种元素和该元素的一个原子的是（ ）下列符号中,既能表示一个原子,又能表示一种元素,还能表示一种物质的是（ ）A．H B．O2 C．He D．N2 为啥选C?A不也是表示
化学
表示一种元素啊!
Young Tommy,aged seven,spent all his spare time with a pencilYoung Tommy,aged seven,spent all his spare time with a pencil and crayons
英语
drawing the wo
把写列各主从复合句变为简单句1.He is so old that he can't work any longer.2.They got up at 6o'clock so that could catch the 6:30 bus.3.Please speak a
英语
little more sl
选择 I think ______ is ______ great fun.A.play the cards,a B.play cards,/ C.playing the car选择I think _______ is _______ great fun.A.play
英语
the cards,a B.
8.When I came into the room,he____on the bed.A.lays B.lies C.was laying D.was lying9.He often plays football in _____spare time.A.a B.
英语
he C.his D./ 1
被动句如何改we often sing this song.he broke his leg in the match.she will sell her house soon.h
英语
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