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问题
名词解释
乔木
答案
参考答案：
指有明显主干，各级侧枝区别较大，分枝离地较大的树木。
问答题
如图所示是一张羽毛和苹果在真空中下落的频闪照片，照片中显示的现象说明了：______．
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选择题
_____ frightened us _____ a tiger turned up suddenly in front of us.
A. It was; that
B. What; was
C. It; that was
D. What; was that
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