单项选择题

Which of the following is not true

A．Sandstorms have caused serious problems to the environment.
B．Sandstorms usually bring yellow sand when they occur.
C．Sandstorms always happen every now and then in the history.
D．Nowadays, sandstorms are mostly caused by men.

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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.

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.