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问题 单项选择题

1762年发表《社会契约论》的法国启蒙思想家是

A．洛克

B．伏尔泰

C．孟德斯鸠

D．雅克卢梭

答案

参考答案：D

选择题

下图为DNA分子在不同酶的作用下所发生的变化，图中依次表示限制性内切酶、DNA聚合酶、DNA连接酶、解旋酶作用的正确顺序是

[ ]

A．①②③④

B．①②④③

C．①④②③

D．①④③②

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填空题

Questions 9-13


·You will hear one passage about science and daily life. Before you listen, read the list of statements, five of which are summaries of how science has changed man’s life. Then listen carefidly and match the statements (A-F) in the correct order (9-13). There is one extra statement that you don’t need to use. You will hear the passage twice.
  • A. Scientific discoveries are companied by the problem of air
    pollution.
  • B. Scientific discoveries have changed man’s moral atmosphere
    and caused ethical issues.
  • C. Scientific discoveries make people use available resources
    more efficiently.
  • D. Medical improvement has made people have a longer life
    span.
  • E. People can communicate with each other more easily.
  • F. Distance between two places is shorted with the advancement
    of transportation.
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