1 Cloze test.
Ocean covers more than 2/3 of Earth, but ocean water is salty. In fact, 1 of the water in the world is not drinkable! Ground water is drinkable, but it is very 2 to pollute it. For example, when 4.5 litres of paint or about 1 litre of oil gets into the ground, it can 3 1,125,000 litres of drinking water!
If you leave the tap 4 while you brush your teeth, you might waste 22.5 litres of water each time. That is 5 to fill 65 cans of soft drink. If you leave the tap on while you wash the dishes, you might waste 135 litres of water each time—enough to wash a whole car!
Believe it or not, the water in our toilets starts 6 fresh water! When you flush the toilet, it uses 6 or 9 litres of fresh water. A shower usually 7 at least 5 minutes. You could use 50 litres of water each time. In a year, that is 8 18,000 litres of water! A bath uses 9 more water than a shower—about twice as 10. A bath can easily use 120 to 160 litres of water.
() 1. A. many
B. much
C. more
D. most
() 2. A. hard
B. easy
C. easily
D. hardly
() 3. A. pollute
B. waste
C. get
D. leave
() 4. A. in
B. out
C. on
D. off
() 5. A. little
B. enough
C. much
D. few
() 6. A. as
B. for
C. to
D. with
() 7. A. costs
B. takes
C. spends
D. pays
() 8. A. almost
B. near
C. most
D. much
() 9. A. ever
B. very
C. quite
D. even
() 10. A. many
B. more
C. much
D. most

1. D
2. B
3. A
4. C
5. B
6. A
7. B
8. A
9. D
10. C

1.水是不可数名词，“In fact”后引导的内容应表达大部分水不可饮用，“most of”表示“大部分”，这里指世界上大部分水不可饮用。所以第1题选D。
2.根据语境，地下水能饮用，但污染它应该是很“容易”的，这里“is”后要接形容词“easy”。所以第2题选B。
3.当油漆或油进入地下，会“污染”饮用水，“pollute”有污染的意思。所以第3题选A。
4.“leave the tap on”是固定短语，表示“让水龙头开着”。所以第4题选C。
5.每次刷牙可能浪费22.5升水，这“足够”装满65罐软饮料，“enough”表示足够。所以第5题选B。
6.“start as”表示“开始是，起初是”，这里指厕所里的水开始是淡水。所以第6题选A。
7.“A shower”作主语，表示“淋浴”这件事，“take”表示“花费”时间，这里用第三人称单数形式“takes”。所以第7题选B。
8.一年大约“几乎”18000升水，“almost”表示几乎。所以第8题选A。
9.“even”用于修饰比较级，表示“更，甚至”，这里指洗澡比淋浴用水更多。所以第9题选D。
10.“as much”表示“和……一样多”，这里指洗澡用的水大约是淋浴的两倍。所以第10题选C。