单项选择题

The passage is mainly about______.

A．what dogs can do.
B．how to keep dogs.
C．dogs and their masters.
D．reasons for keeping dogs.
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单项选择题
If a person practices yoga on a full stomach,________.
A．his general health will benefit greatly
B．he will begin to breathe more regularly
C．his flexibility will decrease
D．he will lose weight readily
单项选择题
The _______mortality rate had gone up greatly during the past 10 years.
A．infant
B．maternal
C．male
D．middle-aged
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