Question

    Picture this: You’re playing soccer with friends. As you kick the ball, you realize the bottom of your foot feels cold and wet. You turn your sneaker up to look at the sole (鞋底). A big crack(裂缝) is letting water from the ground in. When you get home, you throw your ruined sneakers away.

Now imagine another ending to the story. You don’t throw the sneakers away. Instead, you push the two sides of the cracked sole together so they’re touching. You leave the sneaker in a warm spot. A few hours later, the crack disappears.

Thanks to Qiming Wang, a professor at the University of Southern California, a self-healing (自我修复的) sneaker sole could soon become reality. Wang and his team have invented 3D printable rubber that could fix itself. When it’s exposed to heat, it causes a chemical reaction that bonds its atoms back together. The material could be used to3D print not only sneaker soles, but also toys, bike tires, even satellites.

To 3D print a self-healing object, the first step is to make a model of it on the computer. The model is “divided” into 100 smaller pictures. This first picture is projected onto a thin laver (层) of the rubber, which starts as a liquid. The rubber takes on the shape of the picture, and the light from the projection turns it from liquid to solid. The next picture is projected on another layer of liquid rubber on top of the first one. The final, complete shape is built up layer by layer like this.

Many footwear companies want to buy this technology. First, though, Wang and his team have to try to make the material in different levels of hardness. Wang thinks it will take two or three years for their material to show up in shoes we buy in stores.

One exciting thing about the special rubber is the amount of waste it can reduce, Plus, it can self-heal “more than 10 times”. When it can’t heal anymore, it can be recycled.

1.How does the author introduce the topic?

A.By asking questions for readers to think about.

B.By presenting a possible situation in our life.

C.By telling an interesting story about himself.

D.By comparing different research findings.

2.What is the key to the self-healing process?

A.Proper temperature.

B.Strong light.

C.Enough water.

D.Fresh air.

3.What is Paragraph 4 mainly about?

A.The process of 3D printing a self-healing object.

B.The steps to make the self-healing rubber.

C.The material of self-healing objects.

D.The advantages of 3D printing.

4.What do we know about the special rubber?

A.It has a high price.

B.It is environment-friendly.

C.It has a very short usage period.

D.It is being tried by footwear companies.

Answer

1.B

2.A

3.A

4.B

【解析】

这是一篇说明文。文章介绍了南加州大学的王启明教授和他的团队发明了可以自我修复的3D打印橡胶，这种材料不仅可以用于3d打印运动鞋鞋底，还可以用于玩具、自行车轮胎甚至卫星上。同时还介绍了其工作过程和特性。

1.

推理判断题。根据第一段中Picture this: You’re playing soccer with friends. As you kick the ball, you realize the bottom of your foot feels cold and wet. You turn your sneaker up to look at the sole (鞋底). A big crack(裂缝) is letting water from the ground in. When you get home, you throw your ruined sneakers away. 想象一下:你和朋友们一起踢足球。当你踢球时，你感觉到脚底感觉又冷又湿。你把运动鞋翻过来看看鞋底。一个大裂缝让水从地面流入。当你回到家，你就把损坏的运动鞋扔了。以及第二段中Now imagine another ending to the story. You don’t throw the sneakers away. Instead, you push the two sides of the cracked sole together so they’re touching. 现在想象这个故事的另一个结局。你不能把运动鞋扔了。相反，你把破裂的鞋底的两边推在一起，让它们互相接触。可知，作者通过描述我们生活中可能出现的情况介绍本文的主题。故选B项。

2.

细节理解题。根据第三段中When it’s exposed to heat, it causes a chemical reaction that bonds its atoms back together. 当它受热时，就会发生化学反应，使其原子重新结合在一起。可知，适当的温度是自我修复过程的关键。故选A项。

3.

主旨大意题。根据第四段中To 3D print a self-healing object, the first step is to make a model of it on the computer. 3D打印一个自愈物体，第一步是在电脑上制作一个模型。以及The final, complete shape is built up layer by layer like this.最后，完整的形状是像这样一层一层地建立起来的。可知，第四段主要介绍了3D打印自愈物体的过程。故选A项。

4.

推理判断题。根据最后一段中When it can’t heal anymore, it can be recycled.当它不能再愈合时，它可以被循环利用。可知，这种特殊橡胶是环保的。故选B项。