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
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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
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What is the report mainly about
A．Irrigating desert areas.
B．Uses for cold seawater.
C．Techniques for preserving the environment.
D．The importance of conserving energy.
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