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问题 选择题

下列函数关系中是二次函数的是（　　）

A．正三角形面积S与边长a的关系

B．直角三角形两锐角A与B的关系

C．矩形面积一定时，长y与宽x的关系

D．等腰三角形顶角A与底角B的关系

答案

A、关系式为：s=

3
4
a2，故本选项正确；

B、关系式为：∠A=90°-∠B，故本选项错误；

C、关系式为：x=

s
y
，故本选项错误；

D、关系式为：∠A=180°-2∠B，故本选项错误；

故选A．

单项选择题

下列哪个处方不是祛风法常用方剂（）

A.消风散

B.麻黄汤

C.银翘散

D.天麻钩藤饮

E.独活寄生汤
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单项选择题

Why do I want to go to college No one has ever asked me  （1）  a question. But many times I have asked myself. I have（2）a whole variety of reasons.  （3） important reason is that I want to be a better man.Many things make human beings different  （4）or better than or even superior to animals.One of the most important things is（5）. If I fail to receive higher education, my education.（6） As I want to be a fully  （7）man, I must get a well-rounded education, which good colleges and universities are supposed to （8）. I know one can get educated in many ways, but colleges and universities are（9）the best places to teach me how to educate myself. Only when I am well-educated, will I be a better human being and（10） fit into society.

第（5）空应选择（）

A. education   

B. weather   

C. temperature    

D. science
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