2013年职称英语考试理工类题型概括大意习题4_第3页

. （段落主题句）We see something. We try to explain it, and we test our idea by setting up an experiment. One day you come home and find the plant on the table has fallen over. You think it might be the wind from the open window or the cat, so you close the window, but leave the cat in and see what happens (you can also try leaving the window open and shutting the cat out). Of course, you remember there may be a third explanation.

　　 B　How do you find an explanation?
　　 C　What topics do you need?
　　 E　Where does your child study science?
　　 F　How do you set up the experiment on salt and water?
　　 25 Paragraph 3　　　　　　
　　 答案； F（water, salt是段落主题词）
　　 3　Ask your child to get a piece of string, some salt, a glass of water and an ice cube (冰块). Tell her to put the ice in the water, and then put one end of the string on the ice, leaving the other end over the side of the glass. Put a little salt on the ice. Wait a minute, and then pull the string; it should be attached to the ice. Ask the child: "what has happened?"

　　 B　How do you find an explanation?
　　 C　What topics do you need?
　　 E　Where does your child study science?
　　 26 Paragraph 4　　　　　　
　　 答案：B（排除法）
　　 4　Probably she won't know. Ask her whether fresh water or salt water freezes into ice first. If you live near the sea and have a cold winter, she should know fresh water freezes first as she will have seen that happen. Show her how to test the idea by half-filling two paper cups with water, adding salt to one. Then put them in the icebox and check every three minutes. Write the results in a table. The conclusion will be that salt changes the behavior of water. 'Thinking about the string, we see the salt turned some of the ice into water. Then the salt went away into the water and the ice froze again leaving the string attached.

　　 A　the icebox
　　 B　the ice
　　 C　scientific answers
　　 D　the experiment
　　 E　the world
　　 F　water
　　  27 When your child asks you questions, you should give her