单项选择题

______pollution control measures tend to be money consuming, many industries hesitate to adopt them.

A．Although
B．However
C．When
D．Since
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The new currency will get into______ soon.
A．circuit
B．circulation
C．circular
D．circle
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According to the ______of the contract, employees must give six months' notice if they intend to leave.
A．laws
B．rules
C．terms
D．details
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