题目内容

According to the clip, by 2040 up to _____ more countries could be experienced water shortage.

A. 20
B. 30
C. 37
D. 44

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____________ of earth's liquid water is saltwater.

A. 3%
B. 97%
C. 37%
D. 63%

Household water accounts fro only _______ of humanity's water consumption.

A. 3.6%
B. 4.4%
C. 37%
D. 21

Agriculture currently covers ______ of earth's land area posing the biggest threat to our regional water supplies.

A. 37%
B. 63%
C. 3.6%
D. 4.4%

3% of potentially usable freshwater only less than ______ available for sustainly all life on earth.