单项选择题

A．weakens
B．heightens
C．strengthens
D．sharpens
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单项选择题
A．The ground is too hard for planting.B．Transportation is expensive.C．There has been too much rain in the Yangtze River valley this year.D．The planters are experimenting with new crops.
A．The ground is too hard for planting.
B．Transportation is expensive.
C．There has been too much rain in the Yangtze River valley this year.
D．The planters are experimenting with new crops.
填空题
indication。
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