单项选择题
1、 (    )
 

2、 地形等高线向低值方向凸出时，其地形区是（　　）
A．陡崖
B．山脊
C．山谷
D．鞍部


3、 某酯水解生成甲和乙两种物质．同温同压下，相同质量的甲和乙的蒸气占有相同的体积．该酯的结构简式为(  )



4、 如图4-3所示，有一个平行板电容器，所带的电荷量为Q．在电容器内插入一块厚介质板，插入后电容器上（　　）

A．Q不变，U改变
B．Q不变，U也不变
C．Q改变，U不变
D．Q改变，U也改变


5、 填入横线处，语气自然而有情趣的一组句子是（　　）
过了两道小门，真是眼前豁然开朗，另有天地。一眼先是亭亭直上，又刚健又婀娜的白皮松。白皮松不算奇，多得好，__________疏得好，要像住宅的院子里，__________这儿就是院子大得好，就是四方八面都来得好。
①棵挨着棵，枝连着枝，显得挤得慌，
②你挤着我我挤着你也不算奇，
③四角上各来上一棵，疏不是?谁爱看?
④四角上各种一棵，疏是疏了，可是不好看。
A．①④    
B．②③    
C．②④    
D．①③

6、 二次不等式x²-3x+2<0的解集是
A．{x|x≠0}
B．{x|1C．{x|-1D．{x|x>0}


7、
A．diamond
B．object
C．observe
D．seldom


8、阅读下列短文，回答题。
The sun's heat warms the air and makes it move. This movement is called wind. Different parts of the Earth receive different amounts of heat. Near the equator (赤道) , the sun is overhead and heats the Earth intensely (强烈). Nearer the poles, the sun's rays strike the Earth at a low angle so the heat is not so intense.
A lot of the earth's heat is reflected back into spaces, by the atmosphere, clouds, dust in the air and by water, snow and ice. So some parts of the Earth are warm and some are cold. Warm air tends to rise and creates areas of high pressure. As warm air rises, cold air flows in and replaces it. The greater the pressure difference is, the stronger the wind blows.
A strong wind is usually caused by a difference in__________.
A．heat
B．pressure
C．atmosphere
D．air


填空题
9、



10、 曲线y=mx³+1在点(1，1+m)处切线的斜率为3，则m=__________．

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