单项选择题

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

A．On foot.
B．By bus.
C．By car.
D．By bike.

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The paleontologists were puzzled by the fact that the early mammals had high-crowned teeth be cause the grasses at that time were ______.

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