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【单选题】
Why isn't Tim going to write about overfishing?A.
Tim feels that the problem is not as serious as people say.
B.
There are many different solutions and Tim could not choose just one.
C.
Other classmates are writing about overfishing.
D.
Tim couldn’t find a specific solution to concentrate on.
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反馈参考答案：
举一反三
【简答题】What should you do if there is a sudden loss of power? Replace with______．
【单选题】You should inspect the wheels regularly, and replace them ______ they cause you trouble.
A.
while
B.
as
C.
before
D.
until
【单选题】If the tyre leaks, you should first ______.
A.
check the valve
B.
replace the tyre
C.
go to the repairman
D.
pump some air into the tube
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