Question

Water had also appeared on the other planets like Mars but, 1. the earth, it had disappeared later. It was not immediately obvious2. water was to be 3. to the development of life. 4. many scientists believe is that the continued5. of water allowed the earth to dissolve harmful gases and acids into the oceans and seas.

That afternoon 6. the train, the cousins 7. in their seats. Earlier that day, when they crossed the Rocky Mountains, they 8. catch sight of some mountain goats and even a grizzly bear and an eagle. …… Many of them have a 9. for riding wild horses and can win thousands of dollars in 10..

Answer

1.unlike

2.that

3.fundamental

4.What

5.presence

6.aboard

7.settled down

8.managed to

9.gift

10.prizes

【解析】本文主要叙述了水存在的地方以及水的重要性。

1.根据“Water had also appeared on the other planets like Mars but, _____1_____ the earth, it had disappeared later.”可知水也存在于其他星球，但后来却消失了。所以其他星球不像地球那样一直有水存在。故填unlike .

2.根据“ It was not immediately obvious_____2_____ water was to be _____3_____ to the development of life. ”可知“water was to be _____3_____ to the development of life.”在句中作主语从句且不缺少成分，所以要用that引导。故填that 。

3.“water was to be _____3_____ to the development of life. ”水对于生命来说是基础。此处应使用“基础”的形容词形式。故填fundamental。

4.分析句子可知“____4____ many scientists believe”在句中作主语，是主语从句，从句缺少宾语，所以要用what引导。故填 What。

5.根据句意可知：水的存在使得有害气体和酸溶解到地球海洋中。所以此处应填动词“存在”。故填presence。

6.根据“ the cousins _____7_____ in their seats.”可知他和表兄弟已经在火车上，aboard the train 在火车上。故填 aboard 。

7.根据“ the cousins _____7_____ in their seats.”可知他们坐在座位上。settled down in their seats坐在座位上。故填settled down 。

8.考查固定短语。根据“they _____8_____ catch sight of some mountain goats and even a grizzly bear and an eagle.”他们设法看野山羊，甚至一只灰熊和一只鹰。 managed to do sth设法做某事。故填 managed to。

9.根据“Many of them have a ____9____ for riding wild horses and can win thousands of dollars in _____10_____.”可知他们骑野马能赢几千美元的奖励，所以他们很有天赋。故填gift。

10.根据“ Many of them have a ____9____ for riding wild horses and can win thousands of dollars in _____10_____.”可知他们骑马可以赢得奖励。故填prizes。