Forests cover nearly______of the United States, and they yield many valuable products.

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问题 Forests cover nearly______of the United States, and they yield many valuable products.

选项 A、a fourth
B、a third
C、half
D、two thirds

答案B

解析 美国的自然资源非常丰富,土地肥沃,森林覆盖率达31%,约占国土总面积的1/3,为制造业提供了充足的原材料。
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