正确答案:

题目：过去50年来，鄱阳湖湿地大面积减少的最主要原因是

解析：B

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学习资料的答案和解析：

[单选题]下列关于当前世界政治格局的表述，正确的是

即便是最强大的美国也无法控制当今世界

[单选题]CWhen I was seven, my father gave me a Timex, my first watch. I loved it, wore it for years, and haven’t had another one since it stopped ticking a decade ago. Why? Because I don’t need one, I have a mobile phone and I’m always near someone with an iPod or something like that. All these devices(装置)tell the time----which is why, if you look around, you’ll see lots of empty wrists; sales of watches to young adults have been going down since 2007.

have other devices to tell the time

[单选题]Drunk driving,which was once a occurrence , is now under control.

normal

[多选题]在花药和胚珠中，染色体数为N的细胞或核有( )。

卵细胞

营养细胞

解析：DE

[单选题]多管藻属植物的生活史中的配子体、果孢子体和四分孢子体均能独立生活。( )

错误