Passage 62 Will we run out of water one day?
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Do you know why Earth is called the "Blue Planet"? Because water covers up to 70% of the surface(表面)! However, there are still millions of people who have to walk for over half an hour to get clean water. Why is it so ▲ for them to get clean water? Will we run out of water one day?
Most of the water on Earth is too salty for us to use. In fact, only 2.5% of the water on our planet is fresh water(淡水). But we cannot use all of the fresh water. How much fresh water can we use? The answer is less than 1% of the water on our planet!
Luckily, our planet is very good at holding on to water. When water turns into water vapour(水蒸气), it doesn't fly into space. Because the atmosphere(大气层) is very cold, the water vapour condenses(凝结) and falls back to the ground.

The amount of fresh water on Earth stays about the same. However, the number of people on this planet is growing. So more and more people won't get enough clean water. If we don't change the way we use water, this problem will become even worse in the future.
思维新题
根据文章内容,选择正确答案。
()1. The writer starts the passage by .
A. asking a question B. giving an example C. telling a story
()2. Choose one for " ▲ " in Paragraph 1.
A. difficult B. dangerous C. easy
()3. of the water on Earth is the fresh water.
A. 70% B. 2.5% C. 1%
()4. What happens to water vapour in the atmosphere?
A. It disappears into space forever.
B. It condenses and falls back to the ground.
C. It turns into salt water in the ocean.
()5. What can we know from the last paragraph?
A. Earth is losing its water.
B. The water on Earth is becoming too salty to drink.
C. There will not be enough clean water if we don't use it wisely.
日积月累
run out of 用完;耗尽
millions of 数以百万的
in the future 将来

Passage 62
全文翻译
我们有一天会耗尽水资源吗？
你知道为什么地球被称为“蓝色星球”吗？因为地球表面约70%都被水覆盖！然而，仍有数百万人不得不步行超过半小时才能获取干净的水。为什么对他们来说获取干净的水如此困难？我们有一天会耗尽水资源吗？
地球上的大部分水含盐量过高，无法被我们使用。事实上，地球上只有2.5%的水是淡水。但并非所有淡水都能被我们利用。我们可以使用的淡水有多少？答案是地球上不到1%的水！
幸运的是，我们的星球非常擅长留住水分。当水变成水蒸气时，它不会飞入太空。因为大气层温度很低，水蒸气会凝结并落回地面。
地球上的淡水总量大致保持不变。然而，地球上的人口正在增长。所以越来越多的人将无法获得足够的干净的水。如果我们不改变用水方式，这个问题在未来会变得更加严重。
答案详解
1. A 【细节理解】由文章第一句“Do you know why Earth is called the ‘Blue Planet’?”可知，文章以问题开篇。
2. A 【推理判断】由上文的“However, there are still millions of people who have to walk for over half an hour to get clean water.”可知，仍有数百万人不得不步行超过半小时才能获取干净的水。由此可推知，对他们来说获取干净的水是困难的。
3. B 【细节理解】由文章中的“In fact, only 2.5% of the water on our planet is fresh water.”可知，地球上有2.5%的水是淡水。
4. B 【细节理解】由文章中的“Because the atmosphere is very cold, the water vapour condenses and falls back to the ground.”可知，水蒸气在大气层中凝结并落回地面。
5. C 【推理判断】通读最后一段可知，如果我们不明智用水，未来可能没有足够的干净的水。