单项选择题

Questions 26 to 28 are based on the passage you have just heard.

A．To show how dependent men axe on a particular food.
B．To show how primitive the diet of some people is.
C．To show what different foods are eaten.
D．To show-the adaptability of man as regards his diet.

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单项选择题

A．They have great power.B．They have very diversified responsibilities.C．They are very modern and efficient.D．They are so smart.

A．They have great power.
B．They have very diversified responsibilities.
C．They are very modern and efficient.
D．They are so smart.

填空题

environmental

Questions 26 to 28 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。

Questions 26 to 28 are based on the passage you have just heard.