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.
单项选择题
The example of herding in the third paragraph is used to prove that
A．enclosed herding is much safer than open herding
B．enclosed herding will bring better economic results than open herding
C．enclosed herding will cause less damage to the grasslands than open herding
D．enclosed herding can achieve good economic results without causing damage to the environment
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