单项选择题

What is the possible meaning of "visibility" in Paragraph 1

A．Condition for seeing at a distance.
B．Condition for walking at a distance.
C．Condition for driving at a distance.
D．Condition for moving at a distance.

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单项选择题

According to the passage, what kind of environmental problem will sandstorms bring about

A．It will turn cities dirtier than they used to be.
B．It wilt make people hard to breathe clean air.
C．It will prevent people finding their direction.
D．It will cause serious air pollution in people's life.