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[问答题]Directions: In this section, there is one passage followed by 5 questions. Read the passage carefully, then answer the questions in as few words as possible (not more than 10 words). Remember to write the answers on the Answer Sheet.　　Questions 1-5 are based on the following passage.　　If you were on a distant planet, and if you had instruments that could tell you the composition of Earth’s atmosphere, how would you know there was life on this planet?Water in the atmosphere would suggest there could be water on the surface, and as we all know water is considered crucial to life. But water would only suggest that life is possible. It wouldn’t prove it’s there.　　Carbon? That basic component of “life as we know it?” Not necessarily. A diamond is pure carbon, and it may be pretty, but it isn’t alive.　　What really sets Earth apart is nitrogen, which makes up 80 percent of the planet’s atmosphere. And it’s there only because there is abundant life on Earth, say scientists at the University of Southern California　　The report grew out of a class discussion two years ago in a course taught by Capone and Kenneth Nealson, professor of earth sciences. Students were asked to come up with different ideas about searching for life on other planets. What is a distinct “signature,” as Capone puts it, that would show there is life on another planet?　　That’s a question that has been kicked around in many quarters in recent decades, especially since all efforts to find some form of life, no matter whether on Mars or in the distant reaches of space, have failed. At least so far.　　The current effort to search for some evidence of life on Mars focuses primarily on the search for water, because it has long been believed that water, or at least some fluid, is necessary for the chemical processes that lead life to take place. But that’s probably the wrong approach, the USC group argues.　　“It’s hard to imagine life without water, but it’s easy to imagine water without life,” says Nealson, who was on the Mars team before moving to USC.　　But nitrogen would be a much clearer signature of life. Only about 2 percent to 3 percent of the Martian atmosphere is nitrogen. That’s just a trace, and it probably means there is no life on Mars today, and if there was in the past, it probably ended many, many years ago.　　But, the USC team adds quickly, that doesn’t mean there’s no life anywhere else in the universe. They don’t know where, of course, but they may have found a way to narrow down the search. Look first for nitrogen, then look for biological activity that should be there.　　So if life exists elsewhere, and is similar to life as we know it, there should be nitrogen, and that’s what we should be looking for first, the researchers say.　　If they don’t find nitrogen on Mars, Capone says, “that will probably bring us to the conclusion that there likely never was life on Mars.”　　But how about elsewhere? Could this technique be used to search for life in other solar systems?　　Maybe. It might be possible to detect a nitrogen-rich atmosphere around a planet orbiting another star, but not yet. Current instruments aren’t that sensitive.　　If they ever are, the search for life might be narrowed down to the most promising prospects, chiefly because of the presence of nitrogen. And won’t that be fun!　　Questions:　　1．What can suggest life is possible but cannot be proved according to the author?　　2．What is a clear “signature” of life on another planet according to Capone?　　3．What is considered as a wrong way to search for evidence of life on Mars?　　4．What can probably prove there is no life on Mars today based on the new theory?　　5．Why is it impossible to use the new technique to search for life in other solar systems now?

[单选题]有关侵蚀性葡萄胎哪项不正确（）

[单选题]正常情况下，BOM不出售单程票，必要时，须（）授权后方可在BOM上出售单程票。

[多选题]以下（）尺寸和形状的试件可用作砼轴心抗压强度试件。

[单选题]下列关于氨基酸的说法，错误的是（　　）。

[单选题]无轨电车交流传动系统牵引电机的冷却方式为（）。

[填空题]《四师徒》的作者是（）。

[多选题]下列对安全技术交底具体要求的叙述，哪些是正确的（）。

[单选题]电力消费量年平均增长速度除以国民经济年平均增长速度，得到的指标是（　　）。[2017年中级真题]

[问答题]采煤工作面用充填法控制顶板时，有哪些注意事项？