人工接地体的尺寸，钢管壁厚不应小于（）A、4mm B、5mm C、5.5mm D、5

一个钢条靠近磁针的某个磁极时，发现磁极被排斥，则这个钢条[ ]

A.一定具有磁性

B.一定没有磁性

C.可能有磁性，也可能没有磁性

D.条件不足，无法判断

阅读理解

     I came to study in the United States a year ago. Yet I did not know the American society until I was

injured in a car accident because after the accident I had to see a doctor and go to court. After the

accident, my roommate called a doctor for me. I was very grateful and decided to repay him one day.

But the next day, he asked me to pay him $200 for what he had done. I was astonished. He had good

reason to charge me, he said. And if I wanted to collect money from the person who was responsible for my injury, I’d have to have a good lawyer. Now that he had helped me to find a good doctor, it was only

fair that I should pay him.

      But every time I went to see the doctor, I had to wait about 50 minutes. He would see two or three

patients at the same time, and often stop treating one so as to see another. Yet he charged me $115 each

time. The final examination report only contained ten lines, and it cost me $215.

     My lawyer was all smiles the first time we met. But after that he avoided seeing me at all. He knew

very well the other party was responsible for the accident, yet he hardly did anything. He simply waited

to collect his money. He was so irresponsible that I decided to fire him. And he made me pay him $770.

     Now I had to act as my own lawyer. Because of my inexperience, I told the insurance the date I was

leaving America. Knowing that, they played for, time …and I left without getting a cent.

     My experiences taught me two things about America: firstly, in a country like America money is

everything. It is more important than friendship, honor or professional morality; secondly, foreigners are

still being unfairly treated. So when we talk about America, we should see both its advantages and

disadvantages.

1. The author’s roommate offered to help him because ________.

A. he felt sorry for the author.            

B. he thought it was a chance to make some money

C. he knew the doctor was a very good one  

D. he wanted the author to have a good lawyer

2. A good lawyer is important for the author to ________.

A. be properly treated              

B. talk with the person responsible for the accident

C. recover before he leaves America

D. eventually get the responsible party to pay for his injury

3. Which is wrong according the the passage?

A. The author has learned a lot through the experience.

B. Everything about America is advantageous.

C. The author's roommate helped him but charged for that.

D. The author's final examination report only contained ten lines but cost $215.

4. The word charge in the passage means _____.   

A. be responsible    

B. entertain    

C. ask to pay    

D. repay

5. What conclusion can you draw from this story?

A. Going to court is something very common in America. 

B. One must be very careful while driving a car.

C. There are more disadvantages in America than advantages.

D. Money is more important than other things in the US.

正常肝脏平扫CT值为（）

A.0～20HU

B.20～40HU

C.40～60HU

D.60～90HU

E.90～100HU

文学家在克隆一个时代横断面风景线的同时，克隆了自己人生的风景线。品察他们的克隆有双重意义：一是品察在时代变纪中凸现的人文景观，二是品察他们在时代场景中自身的人格取向。
　　这段文字所表明的中心是( )。

A．文学家肩负着反映时代和展示人生的双重任务

B．表现时代和展示人生，是文学创作的双重目的

C．欣赏文学作品可以使读者了解文学家们的社会人格

D．欣赏文学作品有认识时代和文学家人格的双重意义

植物检疫机构对于新发现的检疫对象和其他危险性病、虫、杂草，以下哪种做法是错误的？（）

A、及时查清情况

B、立即报告省、自治区、直辖市农业主管部门、林业主管部门

C、只有达到大范围危害程度时，才能采取措施，进行消灭

D、采取措施，彻底消灭