听力音频：
Questions 31-40
Complete the notes below
Write TWO WORD OR/AND A NUMBER for each answer
Solar Water Purifier
Background
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lack of drinking water
-
drinking bore water is harmful due to the high level of 31. ______ in it
Solar water purifier (SW40)
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can purify bore water
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can process seawater
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processed water can be used in 32. ______
Main problem
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currently, the purification process is too 33. ______
-
but got financial support from an agency called 34. ______
Usages of the device
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maximum amount of water can be produced a day: 35. ______ liters
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the water purified by one of the devices is enough for the needs of a 36. ______
Cross Section for Solar Water Purification
图片链接：
https://mp.weixin.qq.com/s/vrLZKEL3yoH9iesrvn4YEw?token=65820616&lang=zh_CN
37____________
38____________
39____________
40____________
答案
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