单项选择题

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

A．We should drink more hard water.
B．We should drink mere soft water.
C．Ground water is good for the elderly people.
D．Ground water has to be, treated before we drink it.

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单项选择题

A．An essay examination.B．An objective examination.C．An open-book examination.D．A take-home examination.

A．An essay examination.
B．An objective examination.
C．An open-book examination.
D．A take-home examination.

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

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