地球上的淡水资源在全球水量中所占比例极小，而且目前全球超过半数的淡水资源以______的形式存在，尚未被开发利用。
A．两极的冰盖和高山冰川
B．湖泊和河流
C．地下水
D．洋流
参考答案：A
解析： 此题是考查对水资源的基本知识的掌握．根据常识我们知道“湖泊和河流，地下水，洋流”等已被人类开发利用，用排除法可知“尚未被开发利用”的应是“两极的冰盖和高山冰川”。故选A。
| 完形填空。 | |||
| We can use many kinds of energy. Most energy in the l today comes from 2 coal and oil. But this will not be so in the year 2050. We will get much of our energy _ 3 water, the sun and the 4 .We will produce atomic(原子) energy, much more coal and 5 as raw material（原始材料）for cloth, plastics and other things. Some 6 of the world are very dry. Very __7_ people live there, 8 there is a lot of sunshine and wind. With 9 atomic energy and energy from the sun and wind, we will be able to bring fresh water from far away or change sea water 10 fresh water. | |||
| ( )1. A. moon ( )2. A. burning ( )3. A. in ( )4. A. moon ( )5. A. water ( )6. A. parts ( )7. A. few ( )8. A. and ( )9. A. cheap ( )10. A. to | B. sun B. to burn B. from B. cloud B. paper B. places B. little B. but B. expensive B. into | C. world C. boil C. on C. wind C. glass C. hills C. a few C. then C. a little C. from | D. space D. boiling D. to D. snow D. oil D. ground D. a little D. so D. good D. for |