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【单选题】
如图所示，拴羊的小树因树皮被勒断而死去．根据生物学知识，是因为树干上的树皮损伤严重，从而阻断（　　）
A.
有机物的向上运输
B.
水分和无机盐的向下运输
C.
水分和无机盐的向上运输
D.
有机物的向下运输
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【单选题】From the passage, it can be seen that the author _______.
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【简答题】Passage Two Questions 57 to 62 are based on the following passage. A new study from the Center for Information and Research on Civic Learning and Engagement (CIRCLE) at Tufts University shows that tod...
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