A sandstorm is a kind of strong wind that blows over the desert. It raises sand and dust into the air and makes it difficult to see the sun and it reduces visibility of most to zero. It is also known as a dust storm. Some storms are usually the result of convection currents(对流气流)caused by the strong heating of the ground. Then wind is usually strong enough to move a small hill of sand. It can make travel very difficult and can even destroy roads in flat dry areas such as those in the United States.

The Simoom is the strong hot wind that comes across the Sahara and Arabian desert. This wind is the reason for much of the dust in the air over Europe. Evidence(证据)of the dust from Simoom wind has also been found at the bottom of the sea at a long distance from the shore.

Alasksi is the strongest sandstorm. It can destroy all the things in his way. It is very dangerous. It has killed more than one hundred people in the area. The Haboob is a sandstorm that often happens in the area of Sudan around Khartoum. Sandstorms, the height as 5,000 ft (1,525m), also happened, although not often in the United States. It is stronger than the Simoom. One that appeared near Tucson, Arizona, on July 16, 1971, was widely proved by meteorologists.(天文学家)。

1.Which of the following is not a name of sandstorm?

A. Simoom

B. Haboob

C. Khartoum

2.The underlined word "visibility" may mean_______ in Chinese.

A. 模糊度

B. 能见度

C. 对流度

3.Which of the following is TRUE according to the passage?

A. Sandstorms carry lots of sand and dust.

B. Sandstorms are also known as rainstorms

C. Sandstorms are usually the result of wind.

4._____shows the right picture of the three sandstorms in the correct way.

5.What is the main idea of the passage?

A. When sandstorms happen

B. Where sandstorms happen

C. What sandstorms are

阅读下面短文,掌握其大意,然后从各题所给的四个选项中选出一个最佳答案。

Malls are popular for Americans to go to.Some people spend_________much time at malls that they are called “mall rats”.Mall rats shop until they visit hundreds of stores.

People like malls for many________.They feel safe because malls have police stations.Parking is usually_________, and the temperature inside is always fine.The newest malls have beautiful rest areas with waterfalls and large green trees.

The_________mall in the United States is the mall of America in Minnesota.It covers 4.2 million square feet.It has 350 stores, eight night clubs, and a large park! There are parking spaces for 12,750_________.About 750,000 people shop there every week.

The first mall in the United States was built in 1965 in Edina, Minnesota.People love doing all their shopping in_________place(s).More malls are built around the country.Now malls are like town centers where people come to_________many things, they shop, of course, they also eat in food courts that have food from all over the world.They see movies at theaters.Some people even get their daily_________by doing the new sport of “ mall walking.” _________go to malls to meet friends.

In some malls, people can see a doctor or a dentist and even go to the church.In other words, people can do just about_________in malls.Now people can actually live in their favorite shopping center.

1.A.too B.very C.quite D.so

2.A.reasons B.places C.products D.kinds

3.A.expensive B.difficult C.free D.quick

4.A.newest B.largest C.tallest D.biggest

5.A.bikes B.cars C.ships D.buses

6.A.one B.two C.three D.four

7.A.see B.watch C.do D.buy

8.A.activity B.study C.project D.exercise

9.A.The other B.The others C.Others D.nothing

10.A.something B.everything C.anything D.nothing

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