患者，男，34岁，4天前施工时右下肢被石板砸伤，X线摄片，未见骨折，行清创缝合。现突

消除经皮刺激所引起的肌电伪迹的方法是（）

A.检查者触摸针极

B.检查室给予适当的屏蔽

C.移除室内所有不必要的电器

D.关掉经皮神经电刺激器（TENS）

E.拔出室内所有不必要电器的插头

有这样一道题：

先化简，再计算：（2x³-3x²y-2xy²）-（x³-2xy²+y³）+（-x³+3x²y-y³），

其中x=12，y=-1．

甲同学把“x=12”错抄成“x=-12”，但他计算的结果也是正确的，试说明理由，并求出这个结果．

Of all the things that have effects on your future, I believe that personal growth is the greatest. Many people talk about sales growth, profit growth, and possession growth, but none of these will happen without personal growth. In fact I’d like to have you memorize a most important sentence. It is “The key to your future is you yourself.”

There are many things that will help you better your future. If you belong to a strong, dynamic（充满活力的）and progressive company, that will help. Good training will help. Strong leadership will help. If the neighbors stay civil（文明的）, that will help. If your relatives don’t trouble you, that will help…All these things will help. We can go on and on with the list; but remember, the things that I’ve covered above just play minor（次要的）roles in helping you reach a good future. The major cause doesn’t lie outside. It lies inside.

Strangely enough, when two different men work in the same company, the first person may earn $1,000 a month, while the second may earn $10,000 a month. What causes the difference when they have the same job, use the same tools, and get the same training?

The cause of the difference lies in believing, in trying, in accepting failures, in thinking, in a smile at people around, and in the ways of dealing with problems. All of these can be major causes of your good future. You can see all these come from inside. In fact, the real difference is you yourself. You are the key to your future. Teens are the most wonderful and important period in life. If you want a great future, begin to improve yourself from now on!

72. Among all the things mentioned, which one is the most important in the author’s opinion?

A. Sales growth.           B. Profit growth.               C. Possession growth.     D. Personal growth

73. Which of the following may play a main role in influencing you future?

A. Being determined.                     B. Working in good companies.

C. Having rich relatives.           D. Getting leaders’ help.

74. All may cause the two men’s different earnings EXCEPT that_______.

A. the second person buys expensive houses or cars.

B. the first person treats others badly.

C. the second man has a positive attitude to problems.

D. the first man gives up after failures.

75. The passage is mainly written for_____.

A. old people                  B. adults                     C. teenagers             D. babies

试述高吸水性凝胶的结构、组成和吸水性能的关系。