2011年3月22日世界水日主题是“城市用水：应对都市化挑战”。下列有关水的说法中错误的是【 】
| A．水体污染与人类活动无关 |
| B．自然界的水都不是纯净的水 |
| C．水分子保持水的化学性质 |
| D．地球上可以利用的淡水资源有限 |
相关试题
more, and you'll improve your spoken English.
| A． | Speak | B． | Speaks | C． | Speaking | D． | To speak |
--- I've just got a postcard from my pen friend.
--- Let me have a look
. Wow.nice card!
| A． | What | B． | What a | C． | How | D． | Why |
--- What is your favourite sport?
--- Swimming, I think. It's of all.
| A． | earsier | B． | more difficult | C． | the most interesting | D． | the most boring |
---I use your ruler, Lingling?
--- Sure. Here you are.
| A． | May | B． | Would | C． | Need | D． | Must |
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