单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．More work as an instructor.
B．A higher salary.
C．A longer vacation period.
D．A research assignment.

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Discarded plastic bags may become horrible serial killers for animals because of their incredibly slow decay.

单项选择题

Questions 19 to 22 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。