Question

【题目】An Interesting Experiment

Put an ice cube(冰块) from your fridge into a glass of water. 【1】 Thus, you can take out that piece of ice with the help of the string. But you must not touch the ice with your fingers.

You may ask your friends to try to do that when you are having dinner together. 【2】 You must use salt when you carry out this experiment.

【3】 Then put some salt on the ice. Salt makes ice melt(融化). The ice round the string will begin to melt. 【4】 The cold ice cube will make the salt water freeze again.

After a minute or two you may raise the piece of string and with it you will raise your piece of ice!

This experiment can be very useful to you. If, for example, there is ice near the door of your house, you must use very much salt to melt all the ice. 【5】

A. If you don’t put enough salt, the water will freeze again.

B. The string must be at least 10 centimeters long.

C. First you put the string across the piece of ice.

D. We can learn a lot from this physical experiment.

E. But when it melts, it will lose heat.

F. You should have a piece of string 10 centimeters long.

G. There is a salt bottle on the table.

Answer 1

【答案】

【1】F

【2】G

【3】C

【4】E

【5】A

【解析】文章给我们介绍了一个盐帮助冰融化，冰又会使盐水再结冰的实验。

【1】F

考查对上下文的理解和推理判断能力。上句讲把从冰箱里拿出的冰块放进一杯水，根据下句提到的with the help of the string.需要用细绳，F项：你需要有一根10厘米长的细绳，符合此处内容，故选F.

【2】G

考查对上下文的理解和推理判断能力。根据下句提到的You must use salt可知提到盐，G项：桌上有一个放盐的瓶子，与下句连接，故选G.

【3】C

考查对上下文的理解和推理判断能力。与下句Then并列指排列顺序，C项：首先把绳子放在冰上，与下句连接，故选C.

【4】E

考查对上下文的理解和推理判断能力。撒上盐之后冰块开始融化，但当它融化时会失去热量，冰块会使盐水再结冰。此处讲了一个道理，E项连接上下句，故选E.

【5】A

考查对上下文的理解和推理判断能力。根据上面提到的冰块会使盐水再结冰的道理可知如果不放足够多的盐，水会重新结冰。A项表达了此内容，故选A.