单项选择题

What is the main idea of this passage

A．The development of modern drugs.
B．How to make drugs.
C．How to use drugs safely.
D．The development of drugs.
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单项选择题
The author suggests that on hot summer days one should drink _______.
A．warm milk
B．iced tea
C．cold Coca-Cola
D．hot coffee
单项选择题
What should we do to keep enough water in the body
A．To take two liters of water daily all through the year.
B．To eat everything that contains water.
C．To take in as much as we have lost.
D．To drink only when we feel very thirsty.
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