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问题
单项选择题
沿混凝土防渗墙轴线安设的导向槽的深度一般约为（）m。
A.1
B.2
C.3
D.4
答案
参考答案：
B
改错题
下列各句均有一处错误,请找出并改正。
1. —
Whose
pen is
this
? —
It's
her
.
A B C D
( ) _____
2. They
don't
have
any
classes
in
Saturdays
.
A B C D
( ) _____
3. He
enjoys
swiming
in
the river
in
summer.
A B C D
( ) _____
4. The twins
don't
do
their
housework
on
July.
A B C D
( ) _____
5.
What
do
you
do
in
the weekend?
A B C D
( ) _____
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填空题
光效是直射光还是散射光，取决于（）（）（）几个因素。
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