曲线f(x)=x3+x-2在P0点处的切线平行于直线y=4x-1，则P0点的坐标

阅读理解。

     The brain is the boss of the body. Your eyes, ears, nose, and skin tell your brain what is going on

around you. Other parts of your body tell your brain what is going on inside of you. Your brain takes in

the signals. It tells your body what to do with them. When you touch fire, your skin tells your brain that your

finger is too hot. Your brain tells you to move your finger. All these happen very fast. Your brain also

controls your breathing,blinking (眨眼), and heart beat. It controls your feelings and thoughts too. 　　

     Human shave the most developed brain of all animals. Yet it is not the largest brain. The human brain

weighs three pounds. The brain of an elephant weighs 11 pounds. So the largest brain is not always the best

brain. In people, a larger brain does not mean a clever person.

1. What is the main idea of this story? 　　

A. The human brain works very fast. 　　

B. The largest brain is not always the best brain. 　　

C. The brain controls the body. 　　

D. The best brain is the largest brain.

2. What happens after the brain takes in the signals from the body? 　　

A. The brain grows faster and larger. 　　

B. The brain tells the body what to do. 　　

C. The body becomes more developed. 　　

D. We don't know.

3. What does"the boss of the body" mean? 　　

A. The signals. 　　

B. The most developed body part. 　

C. The main part of the body. 　　

D. The centre I centre of the body.

4. Which brain is the most developed? 　　

A. The largest brain.　　　　　　　　　

B. The human brain. 　　

C. The smaller brain.　　　　　　　　　　

D. Not too big brain.

5. What are the things that the human brain does? 　　

A. Takes in signals.　　　　　　　　　　

B. Controls breathing. 　　

C. Controls feelings and thoughts.　　　

D. A, B and C.

—How long have you ________?

—For three days.[ ]

A. got a headache

B. fallen ill

C. caught a cold

D. had a cough

一般要求心电图机的输入阻抗不小于（）。

A.0.5MΩ

B.1.0MΩ

C.1.5MΩ

D.2.5MΩ

E.3.5MΩ

已知A、B两种元素形成的化合物中，A、B元素的质量比为2：3，其相对原子质量之比为2：1，则该化合物的化学式为（　　）

A．A₂B₃

B．A₃B₂

C．AB₃

D．A₃B

要约可以撤回并可以撤销，撤销要约的通知应当在（）。

A.要约到达受要约人之前到达受要约人

B.与要约同时到达受要约人

C.要约到达受要约人之前或者与要约同时到达受要约人

D.受要约人发出承诺通知之前到达受要约人