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问题 解答题
计算：
12
•(
48
-4
1
8
)+
18
÷
3
．
答案

原式=2

3
（4
3
-
2
）+
18÷3

=16-4

6
+
6

=16-3

6
．

选择题
With more forests being destroyed, huge quantities of good earth ____ each year.

A. is washing away
B. is being washed away
C. are washing away
D. are being washed away
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单项选择题 A1型题

骨折刚达到临床愈合时，正处于骨折愈合过程的哪一阶段（）

A.血肿机化演进期

B.骨折后2周以内

C.原始骨痂形成期

D.骨痂改造塑形期

E.永久骨痂形成期
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