单项选择题

What is important in people's lives（）

A．The earth.
B．Birds.
C．Scientists.
D．The natur

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单项选择题

Which of the following statements is NOT true（）

A．Colds are always very dangerous.
B．Colds are often unpleasant though not dangerous.
C．Actually nothing can help get rid of colds.
D．The best way to keep colds away is to be healthy.

单项选择题

（） is mentioned at the beginning of the passage.

A．A love letter
B．A complaint letter
C．A thanks letter
D．An invitation letter