单项选择题

The sad truth is that ecosystems are()fragile and intensely complicated.

A.inherently
B.humbly
C.cautiously
D.industriously

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单项选择题
中国真正的大一统从下列哪个时代开始的:()A.商代B.西周C.东周D.秦汉
A.商代
B.西周
C.东周
D.秦汉
单项选择题
出土文物发生变化的原因是:()A.仅仅是自然原因B.仅仅是人为原因C.自然原因和人为原因D.以上说法都不对
A.仅仅是自然原因
B.仅仅是人为原因
C.自然原因和人为原因
D.以上说法都不对
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