题目内容
9.听第10段材料,回答第18至20题.18.When was Carver born?
A.In 1846.B.In 1864.C.In 1964.
19.From which college did Carver graduate?
A.Iova College.B.Iova University.C.Missouri College.
20.How many uses did Carver discover for sweet potatoes?
A.300.B.200.C.100.
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