【题目】A great number of people in the world have never seen snow.Others see more of it than they want to. Hail is much more common; it happens even in deserts.

Hail is a small round ball of alternating layers(交互层) of snow and clear ice. It forms inside large dark clouds that you can see before or during a storm. There are two ideas about how hailstones from.

One idea shows that hail forms when drops of water freeze in the upper air.

As they fall, they collect more drops of water. They also collect snow. The ice and snow build up in layers. If you cut a hailstone, you can see these alternating layers.

The other idea says that hail starts as a raindrop. The wind carries it higher into the atmosphere(大气层), where it gets covered by snow. It becomes heavy and begins to fall. As it falls, it gets a layer of water, which freezes.

Then the wind carries it back to the snow area, and it gets another layer of snow. This can happen a number of times. Finally the hailstone is too heavy to travel on the wind, and it falls to the ground.

Only a thunderstorm(暴风雨), a storm with loud noises and lightning can produce hail, but very few of them do. Perhaps only one in 400 thunderstorms creates hailstones.

A hailstone is usually less than eight centimeters in diameter. However, hailstones can be much bigger than that. Sometimes they are as big as baseballs. The largest hailstone which people have ever recorded weighed over 680 grams and had a diameter of thirteen centimeters.

Hail can cause the death of plants, especially since hail usually appears in the middle of summer, when the plants are partly grown. If the crops are destroyed, it is too late to plant more, and the farmer has lost everything. In one terrible hailstorm in 1923 in Rostov, in Ukraine, twenty-three people and many farm animals were killed.

1Which of the following is about HAIL?

A. B. C. D.

2According to the passage, which of the following is the fact about hail?

A. Hail is formed of snow and ice. B. Hail can’t be found in desert any more.

C. Hail often comes in cold winter. D. People can see snow more often than hail.

3What does the underlined word “them” in the fifth paragraph refer to?

A. Noises. B. Hailstones. C. Thunderstorms. D. Deserts.

4What do farmers most probably think of hail according to the last paragraph?

A. Unusual. B. Common. C. Useful. D. Terrible.

5What’s the passage mainly about?

A. Different ideas about how hail forms. B. A brief introduction about hail.

C. The size and the weight of hailstones. D. The influence that hail causes.

 0  144100  144108  144114  144118  144124  144126  144130  144136  144138  144144  144150  144154  144156  144160  144166  144168  144174  144178  144180  144184  144186  144190  144192  144194  144195  144196  144198  144199  144200  144202  144204  144208  144210  144214  144216  144220  144226  144228  144234  144238  144240  144244  144250  144256  144258  144264  144268  144270  144276  144280  144286  144294  159627 

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网