单项选择题

You have to be careful when you talk to a Westerner about pigs because（）.

A．they worship pigs best of all
B．they consider pigs as bad animals
C．they aren’t used to talking about pigs
D．they don’t like the topic about pigs at all

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单项选择题

21（）

A.of
B.at
C.for
D.on

单项选择题

His health______, my father retired from the business last year.

A. fails
B. was failed
C. failing
D. failed