What are the limits(极限) of human body? The BBC’s Focus magazine has some answers.
How cold can you stand?
Normal body temperature is around 37℃. At 35℃ you’re unable to write your name. Even walking is very difficult. At 33℃ you may find it difficult to think, understand and form(形成) opinions properly. By the time you have cooled to 20℃, your heart would have stopped beating.
Limit: 0℃. Ice would form in your tissues(纤维组织), killing all the cells.
How spicy can you eat?
There is capsaicin(辣椒素) in many foods. The more capsaicin, the hotter the dishes are. If you’re healthy enough, you can survive(存活) eating a teaspoon of pure capsaicin. But you would find it impossible to eat anything else for a few hours.
Limit: 5g capsaicin.
How fast can you run?
The fastest man in the world is Asafa Powell. The runner finished the 100m in 9. 74 seconds in 2007. This gives an average(平均的) speed of 36. 96km/h.
Top runners are at their fastest around 80 metres, so a runner’s greatest speed may reach 43.06km/h.
Limit: 43.06km/h.
How loud is too loud?
The loudest sound you can hear is 168 dB(分贝). Sound louder than that may do harm to your ears. The loudest sound ever recorded was the eruption of Krakatoa(卡拉卡托火山爆发) in 1883. It was 180 dB, 160km away.
Limit: 168 dB
根据短文内容，回答问题

1. 1.

   At what temperature will your cells die?
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2. 2.

   What will happen if you eat a teaspoon of pure capsaicin?
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3. 3.

   How fast can a runner run at most?
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4. 4.

   What sound can be heard by your ears?
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5. 5.

   Where can you read such an article?
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Last week I went to a supermarket. After I  36  the bill and was passing through the door, the alarm suddenly started to ring. Suddenly, a young guard ran toward me and ordered me to  37 him. I felt so upset and   38  . He took me to a small room, but I was   39  frightened that I stopped at the door. Finding me  40to enter the room, he shouted that I had to go into the room.

He closed the door. I thought he was going to hurt me. Suddenly, a   41   voice said in my ear: “Take out the things you’ve stolen!” “I stole nothing.” I said. “Do as I tell you. If we find them, you’ll be in trouble.” “There is nothing.” I answered. “I didn’t take anything.” I said, taking everything out of my pockets and bag.

  42   this point, a guard came in and asked a salesgirl to   43  me.   44  , they found nothing.

But they didn’t believe that I hadn’t stolen anything. So the young guard ordered me to pass through the door alarm again.

I was   45  when it rang again. I felt   46  and burst into tears. I didn’t know how to prove   47  I was innocent(清白的).

They made me go into the small room again.

 “Take out the stolen things quickly,  48  we will dial 110.” They said.

 “OK, call the police. I’ m not afraid.” I said  49.

Suddenly,  they  50 their tone. After a while, a salesgirl asked me to raise my feet. I did   51   she had told me. There was a label (标签) on the bottom of my shoe. That was it! That was the  52 thing that had brought me such great trouble. But it  53my innocence.（清白）

After that, they 54  to me in the small room, But they should have apologized 55  , shouldn’t they? A lot of people were there when I was taken away. What did they think of me?

1.A．buy                B．paid            C．passed          D．paid for

2.A．obey               B．beg             C．follow          D．listen to

3.A．angry              B．excited         C．happy           D．puzzled

4.A．very               B．much            C．such            D．so

5.A．disagree           B．unwilling       C．voluntarily     D．willingly 

6.A．high               B．low             C．sound           D．sharp

7.A．On                 B．In              C．At              D．From

8.A．look at            B．watch           C．examine         D．keep

9.A．Needless to say B．So far             C．On one hand     D．As a result of

10.A．afraid            B．frightened      C．shocked         D．sad

11.A．wronged           B．upset           C．scared          D．unpleasant

12.A．what              B．whether         C．that            D．how

13.A．and               B．but             C．or              D．so

14.A．unhappily         B．forcefully      C．terribly        D．widely

15.A．changed           B．raised          C．increased       D．closed

16.A．like              B．as              C．according to    D．as if

17.A．only              B．last            C．very            D．just

18.A．tested            B．showed          C．proved          D．gave

19.A．said              B．apologized      C．agreed          D．promised

20.A．loudly            B．together        C．politely        D．in public