单项选择题

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

A．Mary has never studied mathematics.
B．Mary must be good at mathematics.
C．Mary enjoys learning mathematics.
D．Mary probably is poor at mathematics.

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单项选择题

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When we stay at a room in a house with central air-conditioning system in summer, we should set the thermostat to a higher level in ______.

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