单项选择题

The atmosphere is as much a part of the earth as（）its soils and the water of its lakes, rivers and oceans.

A、 has
B、 is
C、 do
D、 are

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单项选择题
（）he will be able to finish the task remains a question.

A、 Which
B、 As
C、 Whether
D、 What.
单项选择题
He tried to join the army but was（）because of poor health.

A、 turned up
B、 turned down
C、 turned off
D、 turned in
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