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Passage 2
Questions 30 to 32 are based on the passage you have just heard.

A．When we are tired.
B．When we have a balanced diet.
C．When we can relax.
D．When we do regular exercise.

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Research carried out in the recent opinion polls shows that ______.

Passage 2Questions 30 to 32 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。