单项选择题

A．Produce larger vegetables.
B．Transport products more quickly.
C．Grow crops in nontraditional climates.
D．Keep vegetables fresher for a longer period.
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单项选择题
A．Intermediate learners.B．College students.C．Beginners.D．Professionals.
A．Intermediate learners.
B．College students.
C．Beginners.
D．Professionals.
单项选择题
A．Irrigating desert areas.B．Use for cold seawater.C．Techniques for preserving the environment.D．The importance of conserving energy.
A．Irrigating desert areas.
B．Use for cold seawater.
C．Techniques for preserving the environment.
D．The importance of conserving energy.
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