单项选择题

What probably leads people to choose gourmet coffees over regular brands

A．Gourmet coffee is less expensive.
B．Regular brands of coffee have too much caffeine.
C．Gourmet coffee tastes better.
D．Gourmet coffee is grown in the United States.

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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.

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