单项选择题

In the past soy beans were grown in the united states mainly______.

A．as the material of tofu(豆腐)
B．for backyard decoration
C．as a vegetable in most backyard gardens
D．as a commercial agricultural crop
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单项选择题
What soy bean product can be used to enrich baked foods
A．Soy bean stalks.
B．Soy flour.
C．Soy bean oil.
D．Soy milk.
单项选择题
What is one important attribute of the soy bean
A．It is a meat substitute.
B．It is often used for backyard decoration.
C．It is a complete milk substitute.
D．It is easily processed into flour at home.
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