题目

如图，平行四边形ABCD中，E，F分别为AD，BC边上的一点，增加下列条件，不能得出BE∥DF的是（ ）A. AE=CF B. BE=DF C. ∠EBF=∠FDE D. ∠BED=∠BFD 答案：【答案】B【解析】试题解析：∵四边形ABCD是平行四边形，∴AD∥BC，，A、∵AE=CF，∴，∴四边形BFDE是平行四边形，∴BE∥DF，故本选项能判定BE∥DF；B、∵，∴四边形BFDE是平行四边形或等腰梯形，∴故本选项不能判定BE∥DF；C、∵AD∥BC，∴ ∵ ∴ ∴四边形BFDE是平行四边形，∴BE∥DF，故本选项能判定BE∥D 短文改错 此题要求改正所给短文中的错误。对标有题号的每一行作出判断：如无错误，在该行右边横线上画一个勾(√);如有错误(每行只有一个错误)，则按下列情况改正： 此行多一个词：把多余的词用斜线(＼)划掉，在该行右边横线上写出该词，并也用斜线(＼)划掉。 此行缺一个词：在缺词处加一个漏字符号(∧)，在该行右边横线上写出该加的词。 此行错一个词：在错的词下画一横线，在该行右边横线上写出改正后的词。 注意：原行没有错的不要改。 Many teachers worry about the effects of televisions on young 　 people．According to studies, any children spend more time 1．_______ watching television than they spend in school．Because so 2．_______ much viewing, children may not be develop the habit of 3．_______ read and the ability to enjoy themselves．No one worries 4．_______ much about the radio program young people listen to, 5．_______ although radios can be very noise．Teachers also wonder about 6．_______ the effects of television commercials．On one year the 7．_______ average child will see 25 000 television commercials, all 8．_______ planned and written by grown-ups to make children to want 9．_______ things that they don’t real need． 10．_______