题干

依次填入下列各句横线处的词语,最恰当的一组是       (  )
①微生物“偷渡”到太空并在空间繁殖,目前已成为载人航天领域中一个________解决的严重问题。
②新区位于城乡________部,是流动人员最多的地方,也是治安状况比较混乱的地方。
③目光短浅的人由于只看到自己的利益,打自己的小算盘,________忽视了集体和国家的利益,这是不值得提倡的。
④尽管这只是一次________,但特警们反应迅速,出击果断,身手敏捷,让我们对此次盛会的安保工作充满了信心。

A:亟待结合从而 演练

B:急需结合进而演习

C:亟待接合从而演练

D:急需接合进而演习

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答案(点此获取答案解析)

C

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    Far from the land of Antarctica (南极洲), a huge shelf of ice meets the ocean. At the underside of the shelf there lives a small fish, the Antarctic cod.

    For forty years scientists have been curious about that fish. How does it live where most fish would freeze to death? It must have some secret. The Antarctic is not a comfortable place to work and research has been slow. Now it seems we have an answer.

    Research was begun by cutting holes in the ice and catching the fish. Scientists studied the fish's blood and measured its freezing point.

The fish were taken from seawater that had a temperature of -1.88°C and many tiny pieces of ice floating in it. The blood of the fish did not begin to freeze until its temperature was lowered to

    -2.05°C. That small difference is enough for the fish to live at the freezing temperature of the ice-salt mixture.

    The scientists' next research job was clear: Find out what in the fish's blood kept it from freezing. Their search led to some really strange thing made up of a protein (蛋白质) never before seen in the blood of a fish. When it was removed, the blood froze at seawater temperature. When it was put back, the blood again had its antifreeze quality and a lowered freezing point.

    Study showed that it is an unusual kind of protein. It has many small sugar molecules(分子)held in special positions within each big protein molecule. Because of its sugar content, it is called a glycoprotein. So it has come to be called the antifreeze fish glycoprotein, or AFGP.