单项选择题

What does" brain drain" ( Line 4, Paragraph 4) mean

A．The exhaustion of the power of thinking.
B．The exhaustion of highly qualified professionals in a country.
C．The highly qualified professionals borrowed from other countries.
D．The movement of highly qualified people toward more favorable environments.

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单项选择题

What is the best thing to do on sleepless night

A．To take some sleeping pills.
B．To drink milk or eat cheese or fish.
C．To find a comfortable position in bed.
D．To do physical exercises.

单项选择题

What will tomorrow’s broadcast be about

A．Neurotransmitter.
B．Body’s natural rhythm.
C．How to keep health.
D．Hints for good health.