Question

The year is 2094. It has been announced that a comet （彗星）is heading towards the earth. Most of it will miss our planet, but two pieces will probably hit the southern half of the earth.

On 17 July, a piece of 4 kilometers wide comet enters the Earth’s atmosphere with a massive explosion（爆炸）. About half of the piece is destroyed, but the remaining part hits the South Atlantic at 200 times the speed of sound. The sea boils and a huge hole is made in the seabed. Huge waves are created and spread outwards form the hole. The wall of water, a kilometer high, rushes towards southern Africa at 800 kilometers an hour. Cities on the African coast are totally destroyed and millions of people are drowned（淹死）.

Before the waves reach South America, the second piece of the comet lands in Argentina. Earthquakes and volcanoes ash set off in the Andes Mountains. The shock waves move north into California and all around the Pacific Ocean. The cities of Los Angeles, San Francisco and Tokyo are completely destroyed by earthquakes. Millions of people in the southern half of the earth are already dead, but the north won’t escape for long. Because of the explosions, the sun is hidden by clouds of dust, temperatures around the world fall to almost zero. Crops are ruined. The sun won’t be seen again for many years. Wars break out as countries fight for food. A year later, no more than 10 million people remain alive.

Could it really happen? In fact, it has already happened more than once in the history of the earth. The dinosaurs were on the Earth for over 160 million years. Then 65 million years ago they suddenly disappeared. Many scientists believe that the Earth was hit by a piece of object in space. The dinosaurs couldn’t live through the cold climate that followed and they died out. Will we meet the same end?

1.What is mainly described in the passage?

A．A historic discovery.

B．An event in imagination.

C．A research on space.

D．A scientific adventure.

2.When the first piece hits the South Atlantic, it causes________.

A．an earthquake                         B．hunger

C．an Earth explosion                       D．huge waves

3.Why can’t the northern half of the earth escape for long?

A．Because the land is covered with water.

B．Because the light and heat form the sun cannot reach the earth.

C．Because people there cannot live at the temperature of zero.

D．Because wars break out among countries.

4.By giving the example of dinosaurs, the author tries to prove_________.

A．animals could not live in the cold climate

B．what happened 65 million years ago was an invented story

C．the human beings will die out in 2094

D．the Earth could be hit by other objects in space

 

Answer 1

【答案】

1.B

2.D

3.B

4.D

【解析】

試題分析：作者講述了 2094 年彗星碎片撞擊地球后可能產生的災難，其目的是警告人們在地球的未來可能會發生災難。

1.主旨題：文章描述了人類在2094年可能會遭遇的災難。這些事情只是一種想象而已。選B。

2.細節題：根據文章第二段Huge waves are created and spread outwards form the hole.可知，應該選D。

3.細節題：文章第三段中提到，南半球的數以萬計的人已經死了，而北半球也逃脫不了 這種厄運。因為太陽多年照不到地球，地球上的溫度幾乎降到了零度。植物遭到了破壞，食物缺乏，導致戰爭。所以，一切的根源在于B選項。選B。

4.推理題：答案在文章最后一段，作者舉恐龍這一例子是為了說明地球很有可能再次遭 遇襲擊。選D。

考點：考查科普環保類短文

點評：作者講述了 2094 年彗星碎片撞擊地球后可能產生的災難，其目的是警告人們在地球的未來可能會發生災難。集中考查了推理題和細節題，要求考生有較強的細節理解能力。做題時也可以結合自己的生活常識和經驗，再通過邏輯推理和判斷。主旨題關鍵是弄清每段的大意，再結合重點的句子判斷。