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孙先生，38岁，对称性全身小关节肿痛反复发作5年，有晨僵，热水浸泡后减轻。化验：类风湿因子阳性。拟诊为类风湿关节炎。

类风湿关节炎的基本病理改变是（）

A.软组织炎

B.肌炎

C.滑膜炎

D.肌腱炎

E.骨膜炎

答案

参考答案：C

阅读理解
阅读下面5段语言材料，请找出与它们相对应的段落大意，并将其标号填入下列横线上。
1. Do you think you have a poor memory? The following
suggestions may help you improve. You may be able to get
better grades!
2. Be interested. Tell yourself that you want to learn what
you need to remember. If you keep thinking about how bad
your memory is, your brain will not be active. Think about
something hopeful.
3. Go over information often and "over-learn". Review
what you've learned the same day you learn it. Look back
on it from time to time. The more often you study the
information, the easier it will be for you to recall it.
4. If you're trying to understand something that's
especially difficult, try to get an overview; don't think too
much about the details. If you're able to explain it to
someone else in your own words, it shows you know it.
5. Do you stay up late? Do you take exercise? Good life
habits help your memory. Exercise brings you enough
oxygen (氧气) and makes your brain more active. 		A. Having interest in what you learn.

B. Give you some suggestions.

C. Reviewing is very important.

D. Having a good life habit is helpful.

E. Understanding is necessary.
1.                 2.                  3.                  4.                  5.             
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计算题

炼钢厂用含SO2的废气制备CuSO4。生产中，向混有CuO粉末的CuSO4溶液中通入废气，反应为：2CuO+2SO2+O2====2CuSO4。欲制得溶质的质量分数为20%的CuSO4溶液。用足量CuO粉末和5000g 5%的CuSO4溶液处理废气。若每升废气中含有1.25 g SO2，且SO2被完全吸收，可处理废气多少升？
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