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.
Susan suggests owners who travel abroad with their pets should look for signs of illness

A．only when taking the trip
B．when going through the customs
C．even some time after coming back
D．at least for four months

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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. Susan suggests owners who travel abroad with their pets should look for signs of illness 您的浏览器不支持 audio 元素。