单项选择题

When one is unfamiliar with the local customs, it is easy to make a______.

A．blame
B．blunder
C．commitment
D．fault
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单项选择题
Some bacteria______extremely harmful, but______are regularly used in producing cheeses, crackers and many other foods.
A．is: the others
B．has been: the others
C．are: others
D．have been: others
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