单项选择题

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A.Soil.
B.Human population.
C.Forest.
D.Water.
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单项选择题
A.A kind of fruit.B.A kind of flower petal.C.Pig fat.D.A natural dye.
A.A kind of fruit.
B.A kind of flower petal.
C.Pig fat.
D.A natural dye.
单项选择题
A.Separate houses were built for storing ice.B.Double walls were built in icehouses to keep cool.C.Blocks of ice were packed with hay in icehouses.D.Ice was put into icehouses in winter.
A.Separate houses were built for storing ice.
B.Double walls were built in icehouses to keep cool.
C.Blocks of ice were packed with hay in icehouses.
D.Ice was put into icehouses in winter.
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