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 accepted （） of adepuate diet have been challenged by new discoveries in nutrition.

A．formations
B．components
C．standards
D．ingredients
单项选择题
The new currency will get into （） soon.

A．circuit
B．circulation
C．circular
D．circle
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