单项选择题

Questions 17 to 20 are based on the following passage. At the end of the passage , you will be given 20 seconds to answer the questions.
Now, listen to the passage.
Which is the best way to keep the pets from oversea diseases

A．Leaving the pets at home.
B．Keeping the pets away form insects.
C．Giving the pets preventative treatments.
D．Training the pets not to bite flies.

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单项选择题

单项选择题

Questions 17 to 20 are based on the following passage. At the end of the passage , you will be given 20 seconds to answer the questions. Now, listen to the passage. Which is the best way to keep the pets from oversea diseases 您的浏览器不支持 audio 元素。