单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．To go shopping.
B．To make a phone call.
C．To take a bus.
D．To give them to the woman.

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Some types of wetlands are so good at this filtration function that environmental managers construct similar artificial wetlands to treat______.

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We should do all we can to protect wetlands to ensure that their functions and values will be preserved for______.

Questions 11 to 18 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。