Question

When we have small cuts in the skin (皮肤), something strange may happen. The cuts are able to heal (痊愈) themselves in a couple of days. How does this happen? Read on, and you will find out the secret.

Every living thing on the earth is made up of cells (细胞). Cells grow and make new cells. Most cells are very tiny and we can’t see them with our eyes. Different cells have different uses. Our skin cells are special ones. The cells on the surface (表面) of our skin are old dead cells. New skin cells are right under the surface. These are the living skin cells. They do work for our bodies. They help protect our bodies and heal cuts.

Our bodies make skin cells all the time. As the old cells fall off, new cells grow in the same place. Each person makes about 18 kg of skin cells during his or her life. Surface skin cells fit together closely with no gaps between them. When you cut or burn yourself, you can harm your skin cells. A small cut will not do much harm. Your skin will quickly heal itself by making new skin cells. How do skin cells work? First, the cells near the cut get bigger and move into the gap. Next, these bigger cells meet in the middle. They form a new layer (层) of skin cells. Finally, new cells will grow until the gap disappears completely. In this way, your skin can grow and get well itself.

How amazing the tiny cells are! Next time you have a cut, don’t worry about it. Maybe in a few days, you will be surprised to find it healed.

1.The underlined word “gaps” in the passage means “_________” in Chinese.

A .突起     B. 条纹    C. 缝隙    D. 代沟

2.From the passage, we know that cells_________.

A. are large and we can see them with our eyes

B. can grow and make new cells

C. aren’t in most living things

D. can’t grow and make new cells

3. Skin cells heal cuts in three steps. _________is the right order.

A. a→b→c   B. b→c→a   C. a→c→b   D. b→a→c

4.Which of the following is TRUE according to the passage?

A. Each person can make 18 kg of skin cells every day.

B. Different cells have different uses in our bodies.

C. The skin cells have little work to do in the body.

D. Every living thing on the earth is made up of skin cells.

5.The best title for this passage should be_________.

A. How skin cells heal cuts

B. The importance of skin

C. How to protect our fingers

D.The importance of cells

Answer

1.C

2.B

3.B

4.B

5.A

【解析】

试题分析：这篇短文作者给我们介绍了细胞，大多数的细胞是极小的，我们不能用眼睛看到它们。还向我们介绍了不同的细胞有不同的用途和伤口是怎么痊愈的。

1.1】C 词义猜测题。根据文划线单词所在句子的上下文的意思可知，表皮细胞之间没有间隙配合在一起。故应选C。

2.2】B 推理判断题。根据短文意思可知，细胞可以生长和制造新的细胞，故应选B。

3.3】B 细节理解题。根据短文第三段可知， First, the cells near the cut get bigger and move into the gap. Next, these bigger cells meet in the middle. They form a new layer (层) of skin cells. Finally, new cells will grow until the gap disappears completely. 首先，伤口附近的细胞变得更大，进入间隙。其次，这些大的细胞在中间碰面。他们形成了一个新的表皮细胞层。最后，新的细胞会生长直到间隙完全消失。故应选B。

4.4】B 推理判断题。根据短文第二段可知，Different cells have different uses.不同的细胞有不同的用途。故应选B。

5.5】A 主旨理解题。根据文意可知，主要介绍皮肤细胞是怎样痊愈的，故选A。

考点：科普类短文阅读。