单项选择题
1、 直线2x+5y-6=0关于y轴对称的直线方程是    (    )
A．2x-5y+6—0    
B．2x-5y-6=0
C．5x+2y-6=0 
D．2x+5y+6=0


2、 下列关于“四一二”政变的表述不正确的是（　　）
A．“四一二”政变是蒋介石发动的
B．“四一二”政变是汪精卫发动的
C．“四一二”政变发生在上海
D．“四一二”政变发生在1927年


3、
A．关于原点对称
B．关于x轴对称
C．关于直线y=1对称
D．关于y轴对称


4、 从某次测验的试卷中抽出5份，分数分别为：
76，85，90，72，77，
则这次测验成绩的样本方差为
A．42．2
B．42．8
C．43．4
D．44

5、 下列各组物质互为同分异构体的是（　　）
A．丙烷和2-甲基丙烷
B．2-甲基丙烷和丁烷
C．乙烯和丙烯
D．乙烷和乙烯


6、 下列各组气态氢化物中，其热稳定性由大到小顺序排列的是（　　）



7、通读下面的短文，回答题。
Living one' s life is really like driving on a highway. First,to drive well,the driver must carefully examine the ____21____ of his car,just as he cares for his own health. Once he goes on the highway,he must ____22____ certain rules for his own safety. Just as he must obey certain rules of society in order to be a decent (体面的) human being. For example, on the highway,he is____ 23____ to keep a constant speed which can be compared with his ____24____ life. Neither driving nor living must be taken at too ____25____ a speed nor at too slow a speed. If he drives over ____26____,the police will give him a ticket,just as he will be arrested when he breaks the law. Acting too conservatively (保守地), he will be called old-fashioned ____27____ others as they drive at the proper speed. When he wants to change lanes, he must pay ____28____ to what he is doing and check in every direction. It is sometimes dangerous to change our way of life____ 29____ one can be sure of success. He ____30____ not make any unnecessary changing of lanes which may be dangerous. Finally, he must discover where he is now by recognizing some ____31____ appearing now and then. If he takes the wrong way,he must return to the right as ____32____ as he can.
But he may thus lose____ 33 ____and energy both on the road and in life. On the whole, driving on a highway and living one' s life are both hard work.____34 ____if he is careful and serious enough,____35____will provide him much pleasure.
________
A．seat
B．condition
C．petrol
D．passenger


简答题
8、通读下面的短文，回答题。
提示：爱丽丝的妈妈病了，爱丽丝想向老师格林先生请几天假。
Alice : Excuse me, Mr． Green． I' d like to take a few days off．
Green : 51 ？
Alice:My mother is ill． I have to take care of her．
Green:Oh dear! I am sorry to hear that． 52 ？
Alice:No,thank you． My mother has caught a bad cold． She has a high fever and coughs dayand night． The doctor says my mother has to be in hospital for a few days． I would like tobe with her．
Green : I understand． 53 ？
Alice:I hope to be back next Wednesday．
Green : That' s all right． 54
Alice:Thank you, Mr． Green． That' s very kind of you． I will write it immediately．Green : 55
第51题 ________


9、计算：
(1)(3+4i)+(5+6i)； (2)(2～i)+(2+3i)；


10、在△ABC中，已知2sin Bcos C＝sin A．
(1)求证：B＝C；

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