单项选择题

Why does the speaker mention air-conditioning

A．It's another possible use for seawater.
B．It's necessary for growing vegetables in hot climates.
C．It's used to cool water used for irrigation.
D．It's the primary use for electricity in the United States.

<上一题目录下一题>

热门试题

单项选择题

What does the new system enable farmers to do

A．Produce larger vegetables.
B．Transport produce more quickly.
C．Grow crops in nontraditional climates.
D．Keep vegetables fresher for a longer perio

单项选择题

How were the pipes used in Hawaii

A．To transport water to higher elevations.
B．To provide air-conditioning.
C．To bring nutrients to the soil.
D．To adjust the soil temperatur