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问题 解答题
求下列方程的解．
x-0.75=
3
4

4+0.9x=112
2
3
x-
1
2
x=
1
9
x
12
=30%
答案

（1）x-0.75=

3
4
，

x-0.75+0.75=

3
4
+0.75，

x=1.5；

（2）4+0.9x=112，

4+0.9x-4=112-4，

0.9x=108，

0.9x÷0.9=108÷0.9，

x=120；

（3）

2
3
x-
1
2
x=
1
9
，

1
6
x=
1
9
，

1
6
x÷
1
6
=
1
9
÷
1
6
，

x=

2
3
；

（4）

x
12
=30%，

x
12
×12=30%×12，

x=3.6．

阅读理解

A good reader is very much like a driver. He must change his reading speed to fit(适应)what he is reading and what he is reading for, just as a driver does to fit the road situation.

A good reader may read at 1,000 WPM(每分钟…词 )when he looks for something for a report in the library. But once he finds what he needs, he may slow down to 100 WPM. A good reader may read newspapers and story books at 600 WPM. But he may read his science or maths books at 150 WPM. Just as a driver has a wide change of driving speed, so a good reader has a wide change of reading speed.

小题1:The writer thinks that a good reader can____.

A．read at 1,000 WPM

B．read as fast as he can

C．change the reading speeds as he needs

D．spend more time reading小题2:A good reader may read fastest____.

A．when he reads newspapers and story books

B．when he reads something most useful to him

C．when he is trying to work out a maths problem

D．when he is trying to find something for his report小题3:Which is the best title for this passage?

A．The Importance of Having Fast Reading Speed

B．A Good Reader and His Reading Speed.

C．The Best Way of Fast Reading

D．The Difference Between Driving and Reading
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填空题

某种物质              叫做这种物质的密度．密度的计算公式是        。密度的单位是               。
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