定义了二维数组A(1 to 6,6)，则该数组的元素个数为( )。A．24个 B．

下列句子中加点的成语的使用，不恰当的一句是                                  （   ）

A．打击假冒伪劣，开展 * * 反欺诈活动，将是工商管理部门新一年的重要工作；同时推进诚信建设，也是他们义不容辞的责任。

B．1962年，美国海洋生物学家蕾切尔·卡逊警告说，地球现在已被工业技术带来的污染破坏了，春天变得死一般的寂静。数十年后的今天，卡逊的警告言犹在耳。

C．那些曾指点江山、叱咤风云的国际政坛人物是不会被历史所遗忘的，他们的一举一动依然吸引着世界的目光。

D．人的志向、情趣千头万绪，幻想用一个模式克隆出“神童”，既不现实，也无必要；既违背教育规律，又扼杀了孩子的天性。

一辆汽车从A地到B地的速度为每小时30千米，返回时速度为每小时20千米，则它的平均速度为（）。

A．24千米/时

B．24.5千米/时

C．25千米/时

D．25.5千米/时

口服避孕药的常见副反应是（）

A.闭经

B.月经过多

C.继发感染

D.经期延长

E.妊娠

阅读理解。

     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 four kilometers wide enters the Earth's atmosphere (大气层) with a massive explosion.

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 sea bed. Huge waves are created and spread outwards

from 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 re drowned.

     Before the waves reach South America, the second piece of the comet lands in Argentina. Earthquakes and

volcanoes are 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 and?

1. What is mainly described in the passage?

A. A historic discovery.

B. An event of 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. damages to cities

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 from the sun can not reach the earth.

C. Because people there can not 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

茶树对土壤酸碱度的反应，并非特别敏感。