听力原文: Science fiction writers have often imagined human beings going to live on Mars. But these days, scientists are taking the idea seriously. It has a great deal to recommend it, since it might solve the problem of overcrowding on the earth. But obviously, it would not be worth making the effort unless people could live there naturally. If the atmosphere were like that of the earth, this might be possible. But in fact it is mostly carbon dioxide. Apart from that, there are other problems to be overcome. For example, the temperature Would have to be raised from 60 degrees below zero to 15 degrees above it. Scientists who study Mars have laid down the program that they can follow. To begin with, they will have to find out whether life has ever existed on the planet of Mars in the past. Secondly, they will have to make a reliable map of its surface. And finally, they will have to make a list of the gases. Above all, they will have to discover how much nitrogen it possesses, since nitrogen is four fifths of the air we breathe. They are surprisingly optimistic about raising the temperature on Mars and believe it could be done in two hundred years. It will take a bit longer, though, to transform. the atmosphere so that human beings, could live there. Scientists estimate that this will take one hundred thousand years.
(33)
A.Because people might have to migrate there someday.
B.Because it is very much like the earth.
C.Because it is easier to explore than other planets.
D.Because its atmosphere is different from that of the earth.
第1题
电化学发光免疫分析中,最常使用的标记物为
A.吖啶酯类
B.三丙胺
C.鲁米诺类
D.三联吡啶钌
E.三氧乙烷
第2题
电化学发光免疫分析中,最常使用的标记物为
A、三联吡啶钌
B、三丙胺
C、啶酯类
D、米诺类
E、聚氧乙烷
第3题
在化学发光免疫分析中,常作为标记物的发光物质为
A.吖啶酯类
B.三丙胺
C.鲁米诺类
D.三联吡啶钌
E.三氧乙烷
第4题
电化学发光免疫分析中,最常使用的标记物为
A、三联吡啶钌
B、吖啶酯
C、鲁米诺
D、酞箐
E、异鲁米诺
第5题
电化学发光免疫分析采用什么物质标记抗体(抗原)
A.三联吡啶钌
B.碱性磷酸酶
C.三丙胺
D.鲁米诺
E.吖啶酯
第7题
电化学发光免疫分析(ECLIA)常采用的标记物是
A、吖啶酯
B、HRP
C、ALP
D、三丙胺
E、三联吡啶钌
第8题
既作为标记物又须在电极表面产生发光效应的物质为
A.吖啶酯类
B.三丙胺
C.鲁米诺类
D.三联吡啶钌
E.三氧乙烷
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