() 1. ______ kinds of water are mentioned at the beginning of the passage.
A. Two
B. Three
C. Four
() 2. About ______ of the Earth's fresh water can be drunk.
A. 0.5%
B. 1%
C. 2%
() 3. About ______ of the fresh water on Earth is frozen.
A. 70%
B. 97%
C. 12%
() 4. The total amount of water we use is called "______".
A. water cycle
B. water flow
C. water footprint

A1 Complete the passage with the given words in their proper forms. 用括号中所给单词的适当形式完成短文。
Last week, our class learned about water pollution. The teacher said clean water is very (1) (use) for life, but some rivers are (2)______ (fully) of harmful things. We also learned that pollution has (3)______ (direct) effects. For example, factories might not pollute rivers directly, but their waste can still harm fish. At the end of the class, the teacher showed us a photo of a fish weighing five (4)______ (kilo). He said pollution made it sick.
This Thursday, Lily gave a (5) (present) about water (6)______ (treat) methods. She explained how special (7)______ (chemistry) can clean dirty water. At first, I thought it would be (8)______ (bored), but her talk was actually interesting!

A2 Write the words and phrases according to the given Chinese. 根据所给中文写出相应的单词和词组。
1. 节约用水的必要性________
2. 越······越······________
3. 把······列为······的一部分________
4. 立即;马上________