问题补充：
Below is a table which shows the melting(液化)and boiling points of common substances.Study the table.Then do Numbers 4—7.
Substance
Melting point(C)
Boiling Point(C)
Water
Alcohol
Nitrogen
Oxygen
0
–117
–210
-218
100
78
–196
–183
【小题1】The underlined word‘substancesmeans‘a type of.A．matterB．liquidC．solidD．gas【小题2】Which of the four should be a liquid at-90 degrees?A．waterB．alcoholC．nitrogenD．oxygen【小题3】Mixing alcohol and water is often used to wash windscreens of cars during the wintertime because .A．it is easier for alcohol to change into gasB．alcohol is not easily separated from waterC．alcohol freezes at lower temperature than waterD．the mixture is not expensive【小题4】In order to change water from a solid to a liquid energy must be .A．removedB．addedC．createdD．destroyedA
答案：
(答案→)A
解析：
【小题1】substance表示“物质”的意思。
【小题2】因为根据表格所示酒精在-117度开始溶化，那么在-90度时肯定是液体。
【小题3】冬天天气寒冷，酒精比水不容易结冰。
【小题4】水从固体变成液体，必需加温。
