单项选择题

“温室效应”主要是由下列哪种物质引起的( ): A.
SO2 B.
H2S C.
CO D.
CO2 E.
H2SO4

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Which of following expressions are more polite? A、Let's make sure we stay in our little sections over here. B、Stay away from me. C、Step back! D、Let's just put a little bit of space in between each other.
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路由表的分组转发部分由_______组成。 A、交换结构 B、输入端口 C、输出端口 D、以上都是
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