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问题 选择题
在式子
4
a
、
a
4
、
2xy
π
、
5
6+x
、
x
7
+
y
8
、
1
x
+
1
y
中，分式的个数是（　　）
A．2B．3C．4D．5
答案

a
4
、
2xy
π
、
x
7
+
y
8
的分母中均不含有字母，因此它们是整式，而不是分式．

4
a
、
5
6+x
、
1
x
+
1
y
中分母中含有字母，因此是分式．

故选B．

填空题

根据下列句子及所给单词的首字母,写出各单词正确的完全形式(每空限写一词).

1. It is no c__________ that these are the areas where languages are disappearing the fastest.

2. The teacher a__________ the new method of teaching was popular with the students.

3. A lamp is c__________ but its brightness is abstract.

4. I hope I don't c__________ the wrong idea that I'm productive all the time.

5. He worked so hard that e__________ he made himself ill.

6. Some young people couldn't bear up under the s__________ of the modern life.

7. This would create an "historic opportunity" for China to s__________ its position.

8. For these reasons, I would be o__________ to the construction of a new factory near my community.

9. And on b__________ of the American people, I thank the world for its outpouring of support.

10. With the g__________ of grade, students spend fewer hours in doing some extra-curricular reading.
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判断题

胎模锻由于使用了胎模，所以降低了工人的劳动强度。
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