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问题 解答题
①a+2-
4
2-a
 
②
12
m2-9
+
2
3-m
 
③（1-
1
1-x
）÷
x
x-1

④（
x-2
x+2
-
x-2
x+2
）
x2-2x
x2
．
答案

①原式=

(a+2)(a-2)
a-2
+
4
a-2

=

a2
a-2
；

②原式=

12-2(m+3)
(m+3)(m-3)

=

-2(m-3)
(m+3)(m-3)

=-

2
m+3
；

③原式=

1-x-1
1-x
•
x-1
x

=1；

④原式=0．

选择题

At first they worried about the situation but things ____ quite well.

A．went on

B．carried on

C．worked out

D．tried on
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单项选择题


Passage One

What happened to Jamaica’s sugar factories in the 1990s

A．They witnessed unsuccessful reforms.

B．They went bankrupt due to crop failure.

C．They suffered from inefficient production.

D．They failed due to a shortage of labor supply.
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