下列有关主诉的描述，不正确的是（） A.主诉是患者病后感受最痛苦的症状 B.主诉可初

阅读理解

Dear Tommy,

       I'm writing to you on your third birthday. I want to tell you something about your grandma's time. I

was born sixty-eight years ago in a small village. 

       Transportation used to be a big problem. When we traveled from village to village, we used to walk

or ride horses.

       Shopping was not an easy job, either. There were no supermarkets in the neighborhood. We used

to grow most of our own food: rice and vegetables. We kept things cool in a special underground room.

       The biggest difference is that you have electricity (电). We didn't have electricity until very late in

our small village. We didn't have any televisions of course. We used to perform our local (地方的) music and enjoy it very much.

       Life used to be very hard, but I was not upset. I would like you to know about the old days and be

happy about what you have when you grow up. Remember, feeling good about life is the key to happiness.

                                                                                                                                         Love,

                                                                                                                                         Your grandma

根据书信内容，选择最佳选项。

1. This letter is written by          .

A. a grandfather to a grandson

B. a grandmother to a grandson

C. a grandfather to a granddaughter

D. a grandmother to a granddaughter

2. Tommy is           when the letter is written.

A. one      

B. two        

C. three        

D. four

3. This letter is mostly about         .

A. the writer's old life experience

B. the writer's future life

C. what a kid can do for old people

D. how the writer has changed

4. Which is NOT true about the writer?

A. She was born in the countryside.

B. She felt good about the village life.

C. She used to grow vegetables in the village.

D. She used to walk or ride horses from city to city.

5. Why did the writer write this letter?

A. She wanted to show that life now is really happy.

B. She wanted to tell others that life was so hard in the past.

C. She wanted the kid to be positive about life in the future.

D. She wanted the kid to dream about his future life.

抛物线y=x²-bx+9的顶点在x轴上，则b的值一定为（　　）

A．0

B．6

C．-6

D．±6

我厂中压联合汽阀阀杆漏汽有几级？接至何处？

两栖动物

某男性患者，56岁，患冠心病多年，3小时前突然出现双下肢剧烈疼痛，行走困难，局部皮肤苍白，查双下肢股动脉搏动消失，双膝以下皮温低，肌力4级，中医诊断初步为（）

A.青筋腿

B.股肿

C.脱疽

D.臁疮

E.血瘤