单项选择题

Now many manufacturers build their business reputations by enclosing ______ in the new products in case of damage in shipment or by incorrect operation.

A. categories
B. accessories
C. analogies
D. observatories
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单项选择题
There have been several attempts to introduce gayer colors and styles in men's clothing, but none of them（）

A．has caught on
B．has caught him out
C．has caught up
D．take roots
单项选择题
Every member of society has to make a （）to straggle for the freedom of the country.

A. pledge
B. warranty
C. resolve
D. guarantee
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