Sandstorms hit northwestern China's Gansu Province and North China's Inner Mongolia Autonomous Region on the first day this year. According to Sun Landong， a meteorologist with the Lanzhou Meteorology Observatory，visibility was less than 100 meters in Minqin， a Gansu county near Inner Mongolia， because of sand. When visibility drops to less than 1 kilometer，it is called a sandstorm. The sandstorm in Minqin blew up dust in neighboring towns， such as Baiyin， Wuwei， Jinchang and Lanzhou， the capital city of Gansu Province. Dust-laden winds also swept into Beijing. Brought by northwesterly blowing at more than 20 meters per second，dust first reached the capital's suburbs at 7 a. m，downtown areas at 9 a. m. The winds，which died down during the night，brought the temperature down to as low as 80C below zero and many flights put off their planned time from the city's airport.
It is quite rare for sandstorms，which are frequent between March and June，to happen in winter，when the earth is frozen. The sandstorms in Gansu and Inner Mongolia do not necessarily mean there will be more of them in the spring than last year，when they were serious，but Beijing is taking it very seriously. It is reported that Beijing will spend 6 billion yuan ( US 725 million) in preventing sandstorms in the capital and has already set up a spe­cial team to make sure what causes them.
【小題1】 What is the main idea of the passage?

A．Sandstorms took place in Gansu.
B．Sandstorms happened on the first day of the new year.
C．Sandstorms are very serious，compared to last year.
D．Experts are trying their best to determine the cause of the sandstorm formed this year.
【小題2】Suppose the dust was 300 kilometers away from Beijing， it would reach Beijing about
hours later if it travels at a speed of 20 meters per second?
A．4. 2 B．1. 5 C．2. 0 D．2. 5
【小題3】Why did sandstorms begin in the winter this year?
A．Because there was little snow this season.
B．Because a lot of trees have been cut down.
C．Because people took few measures to control them.
D．It is not mentioned in the passage.
【小題4】 Which of the following doesn't belong to the bad effect the sandstorms have done in Bei­jing?
A．The temperature fell. B．Flights put off their time to take off.
C．The air is dirty. D．People had three days off.
【小題5】The author wrote the passage to        .
A．tell us the environments are becoming worse and worse
B．explain what measures people have taken to control sandstorms
C．make people realize the need to protect the environment.
D．call on us to do what we can to save the earth

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