题目

下列各项中表达正确的是( ) A. HCl的电子式：               B. N2的结构式： C. H2S的电子式：              D. 次氯酸的电子式： 答案：B 阅读短文，从方框中选择适当的词并用其正确形式填空，使短文通顺、意思完整。请将答案写在下面题号后的横线上。每空限填一词，每词限用一次。方框中有两个词是多余的。what, never, ever, but, difficult, dangerous, take, make, little,   shape, in，easy    In some science fiction movies (科幻电影)，the robots are just like humans. They help people with the housework and do the most 1     jobs. Some scientists believe that there will be such robots in the future. However,they agree it may 2      hundreds of years. Scientists are now trying to 3      robots look like people and do the same things as us.   But robot scientist James White disagrees. He thinks that it will be 4     for a robot to do the same things as a person. For example,it’s easy for a child to wake up and know where he is. Mr. White thinks that robots won’t be able to do this. But other scientists disagree. They think that robots will be able to talk to people 5      25 to 50 years.  Robot scientists are not just trying to make robots look like people. For  ,there are already robots working in factories. They do simple jobs over and over. People would not like to do such jobs and would get bored. But robots will 6      get bored.In the future,there will be more robots everywhere,and humans will have 7      work to do. New robots will have many different 8      Some will look like humans,and others might look like snakes. After an earthquake,a snake robot could help to look for people under buildings. That may not seem possible now,9      computers,space rockets and even electric toothbrushes seemed impossible a hundred years ago. We never know 10      will happen in the future!Because we are living in a world full of possibilities.1.        2.        3.        4.        5.        6.      7.      8.      9.      10.