听力音频：

1. ______ migration and booming population caused shortage of water.
2. Water is collected by israeli company’s devices to ______ the humidity of the air.
3. Fresh water obtained by technology of salted water treatment from ______
4. Vilagers works in cities can increase their ______
5. Alter way of ______ might be an option to save water.
6. the treadle pump use plastic ______ to collect water.
7. There is ______ to remove particles or grain.
8. The tank’s function. to ______ water.
9. Production of ______ for vehicle, such as deisel, worsen situation in some countries.
10. Worker only need 2 days ______ in the process.

答案