题干

如图是美国科学家米勒设计的一个化学进化模拟装置.将一种混合气体从a处泵

入该密闭装置内,再把B中的水煮沸,使水蒸气驱动混合气体在玻璃管内流动,然后在A内放电7天,经b处冷却后,产物沉积在C中,产物中含有多种有机物.请回答:

(1)加入的混合气体是____ ;与现在大气相比,没有____ .

(2)C中的液体相当于____ .

(3)A内为模拟____ 中发生的现象.

(4)实验后,抽取C处的液体检验,有____ 等物质生成.

这个实验表明在原始地球的条件下,由____ 物质形成____ 物质是可能的.

上一题 下一题 0.0难度 选择题 更新时间:2019-07-20 06:02:11

答案(点此获取答案解析)

甲烷、氢气、氨等,氧气,原始海洋,原始大气,氨基酸,无机小分子,有机小分子

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    They say after a parents dies, the surviving children can taken on some of their parent's characteristics. I 1becoming anything like my dad for years 2I wanted to be me, not him; but there I sat at his memorial service several months ago, telling myself, “ You've 3a lot more of your dad in you than you think.”

    There is this phrase my dad 4, and I know I'm going to sound 5to complain about it, but it used to 6me. “ I am so proud of you,” he told us kids, whether we'd won a race or helped others. That should be a (n) 7thing, but here's what always 8 my mind: “ You are taking credit for what isn't really yours. You can be proud, but the 9 is mine.

    Your parent is doing his best to give you 10, but you do not 11it. “ I'm so proud of you.” It came out of my dad's mouth 12, on those calls where I might have 13  something that happened at work or when he and Mom came to visit and we 14the talents of our two boys. I knew the feeling of parental 15well, especially when my boys achieved in ways that were  16my comprehension and ability, but I looked for other ways to 17 it. “ That's an extremely good story you've written!” I would say about the composition. I thought that by making my praise 18, it would feel like I was claiming their achievement less as mine and more as one they could own themselves.

    So just the other day when my older son sent me an email about his scholarship, I searched  for 19things to say, but finally20he doesn't need my cleverness. They just want what my dad gave me. “ I'm so proud of you,” I wrote. Just like the old man to me.