单项选择题


A．income
B．outcome
C．calculation
D．expenditure
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单项选择题
A．unlessB．whetherC．asD．though
A．unless
B．whether
C．as
D．though
单项选择题
What is the specific feature of fossil fuels
A．They are colorless.
B．They are odorless.
C．They are rich in carbon.
D．They are easy to freeze.
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