单项选择题

The atmosphere is as much a part of the earth as ______its soil and the water of its lakes, rivers and oceans.

A．are
B．is
C．do
D．has
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单项选择题
A man escaped from the prison last night. It was a long time ______the guards discovered what had happened.
A．before
B．until
C．since
D．when
单项选择题
After a meal in a restaurant, you ask the waiter for the______.
A．bill
B．note
C．receipt
D．menu
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