单项选择题
1、 已知函数ƒ(x)=3x，那么函数ƒ(x)的值域为（　　）
A．{y | y>1}
B．{y | y>0}
C．{y | y>0且y≠1}
D．R


2、 （    ）
 


3、 曲线y=x3-5x+l在点(2，-l)处的切线方程为  （    ）
A．7x—Y一15—0    
B．7x-Y+15=0
C．x+y-1=0 
D．z+y+1=0


4、 图5-1中，P点位置同时符合：①东半球、②北半球、③低纬度、④我国境内四个条件的是（　　）

5、通读下面的短文，回答题。
     Life gets noisier every day and very few people can free from noise of some sort or another．Itdoesn’t matter where you live—in the middle of a modem city．or a faraway village--the chancesthat you will be disturbed by jet aeroplanes，transistor radios，oil powered engines，etc．，are almosteverywhere．We seem to be getting used to noise，t00．Some people feel quite lonely without back—ground music while they are workin9．
      Scientific tests have shown that total silence can be very frightening experience for humanbeings．However，some people enjoy listening to pop music which is very loud，and this can do harmto their eardrums(耳鼓)．The noise level in some disco is far above．the usual safety level for heavy,noUstnal areas．
     One recent report about noise and concentration(专心)suggested that although a lot of peoplesay that any noise disturbs their concentration，what really affects their ability to concentrate is achange in the level of noise．It goes on to say that a background noise，which doesn’t change toomuch(music，for example)may even help people to concentrate．
From this passage，the pollution of noise________．
A．doesn’t matter much
B．has become worse everywhere
C．has become better in big cities
D．has become better in villages


6、 He suddenly returned__________a rainy night．
A．at
B．on
C．in
D．During


7、 Jack came to the party__________．
A．without inviting
B．without invited
C．without being invited
D．without a invitation


8、设x，y∈R．命题甲：“x²=y²”，命题乙：“x=y”，则甲是乙的
A．充分但不必要条件
B．必要但不充分条件
C．充分必要条件
D．既不充分也不必要条件


9、 填入下面这则新闻空缺处恰当的一项是（　　）
据新华社电  在西班牙西北部加利西亚省海域搁浅并发生燃料泄漏的巴哈马籍油轮“威望号”11月19日发生断裂并开始下沉。这艘船共装有7．7万吨燃料油。
A．加利西亚省官员称，“威望号”油轮断裂成两半，使得控制污染的难度大大增加，对当地生态环境构成严重威胁。
B．加利西亚省官员痛心疾首地说，“威望号”油轮裂成两半了，这使得控制污染的难度大大增加，对当地生态环境构成严重威胁。
C．加利西亚省官员称，“威望号”油轮断裂成两半，对当地生态环境构成严重威胁，以致控制污染的难度也大大增加。
D．加利西亚省官员称，“威望号”油轮断裂漏油，这种泄漏使控制污染的难度大大增加，以致使得当地生态环境受到严重威胁。

填空题
10、 某运动员射击l0次，成绩(单位：环)如下
     8  10  9  9  10  8  9  9  8 7 
则该运动员的平均成绩是___________环．

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