According to the passage, what kind of environmental problem will sandstorms bring about? What is the possible meaning of "visi

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问题 According to the passage, what kind of environmental problem will sandstorms bring about?
What is the possible meaning of "visibility" in Paragraph 1?

选项 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.

答案A

解析
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