(Para. 1, Passage 4) Flying over a desert area in an airplane, two scientists looked down with their trained eyes at trees and b

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问题 (Para. 1, Passage 4) Flying over a desert area in an airplane, two scientists looked down with their trained eyes at trees and bushes.

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答案两名科学家乘飞机飞过沙漠上空,用他们受过专业训练的眼睛观察树木和灌木丛。

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