国产药品的有效期正确表达方式为：（）。A、有效期至2006年12月 B、有效期至200

已知函数f(x)＝ax²－ln x，x∈(0，e]，其中e是自然对数的底数，a∈R.

(1)当a＝1时，求函数f(x)的单调区间与极值；

(2)是否存在实数a，使f(x)的最小值是3？若存在，求出a的值；若不存在，说明理由．

用适当的代词或数词填空。

1. The boy is crying. I think ________ is hungry and wants ________ mother.

2. Helen is a student and Miss Smith teaches ________ English.

3. I'm old enough now. I can finish the work by ________.

4. Come on Monday or Wednesday. ________ day is OK.

5. —Are the keys ________, girl?

    —No, they are not ________.

6. Obey the traffic rules and learn to protect yourself. ________ is more important than life.

7. —What _______ do you want to have?

    —Thanks, that's enough.

8. Xiao Li is the right person who shows the foreigners around, for ________ of us can speak English.

9. —Which trousers are his?

    —The green ________ are his.

10. Tom often comes to see me. He is a friend of ________. 

11. September the ________ is Teachers' Day. Let's make some cards for our teachers.

12. The text is very easy. There are ________ new words in it.

13. —________ is wrong with my throat. I just feel thirsty.

     —Why not have ________ water?

14. —Shall I sit at this end of the boat or the other end?

     —If you keep still, you can sit at ________ end.

15. Our teacher asks us to read English ________ a day.

16. We enjoyed ________ at the party last night.

17. He has a dog. I want to have ________, too.

下列哪项是冷疗的适应证

A．牙痛

B．痔疮

C．胃痛

D．腰肌劳损

E．腕关节扭伤3天后

One of Lewis Gordon Pugh’s first big attempts to put his cold-water skills to the test nearly ended in disaster. On a one-mile swim in Antarctica in December 2005, just yards from the finish, his body began to give in. The temperature inside his thigh muscle dropped to 87.8 degrees, the lowest ever measured in him. He was completely at the limits of his ability.

Despite what he called the “grueling (折磨人的)” Antarctic swim, Pugh scheduled an even more fearsome test for himself at the North Pole. Stepping off the way of the Russian icebreaker that had crunched(咯吱作响的穿过) through floating sea ice for five days to take him to the North Pole, Pugh walked across the ice to a pool of open water over one mile long and two and a half miles deep. The sea temperature was 29 degrees, only a little above the freezing point of salt water.

Pugh quickly took off his padded clothes. In only his bathing suit and cap, his skin already pink, he walked to the water’s edge. “The only place I’m getting out is at the end,” he told himself. Then he removed his earphones and dived in.

The pain was immediate. His entire body felt on fire. The doctor kept pace with him in a boat. Through iced-up goggles(护目镜), Pugh could see the armed guards keeping watch for bears.

His friend Becker had broken down the huge task into manageable parts, each one marked by a flag planted in the ice that represented a friend, family member, or teammate. Fog started to roll in as Pugh headed for the final marker, the flag of Great Britain. He imagined his late father standing beside it--- the man who had done so much to give him an interest in adventure. Then Pugh drove himself to the finish. After 18 minutes 50 seconds in the water, his body was not even hypothermic(体温过低的).

小题1:.

Why did Lewis Gordon Pugh swim in Antarctica in December 2005?

A．To train his determination.

B．To end a disaster.

C．To test his cold-water skills.

D．To check the temperature in Antarctica.小题2:.

. It can be inferred that in the pool at the North Pole Lewis Gordon Pugh __________.

A．had to suffer from the cold water with his goal to achieve

B．dived to the depth of two and a half miles

C．broke the records that the Russian kept

D．spent nearly 19 minutes walking over one mile小题3:.

. To make sure of the successful test in the pool at the North Pole, __________.

A．Lewis Gordon Pugh had to carry flags

B．Lewis Gordon Pugh was accompanied by his father

C．Pugh took measures to keep his body temperature

D．Pugh’s task was separated into several parts

顺丁胶