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.
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