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问题 选择题

在|-2|，（-2），（-2）5，-|-2|，-（-2）这五个数中，负数共有（　　）

A．2个

B．3个

C．4个

D．5个

答案

∵|-2|=2；

（-2）=-2；

（-2）5=-32；

-|-2|=-2；

-（-2）=2．

∴负数有（-2），-|-2|，（-2）5，共3个．

故选B．

问答题

小明的妈妈在小商品市场买了一个移动多用插座，在厨房中使用（如图甲所示）不久，就发现插座的导线很烫、且闻到一股焦糊味．是因为插接的电器过多？还是插座本身是劣质产品？小明首先观察了电器的铭牌，获知各电器的规格为：插座“220V 10A”、电饭煲“220V 700W”、微波炉“220V 1050W”．接着小明进行了下列探究．

（1）小明猜想：导线过热是不是接插电器过多？请你帮他写出计算判断过程．

（2）小明猜想：导线过热是不是因为导线太细？写出他这样猜想的依据．

（3）为了证实猜想，小明用图乙中的方法测量了插座导线铜芯的某个数据，搜集了以下资料（如图乙和表格，图中线圈为32匝），请你帮小明判断插座的优劣．

铜芯塑料绝缘电线安全载流量
直径/mm…0.880.941.021.121.38…
安全电流/A…68101112…
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阅读理解
请阅读下列应用文及相关信息,并按照要求匹配信息.
首先,请阅读下列几种急救措施的相关信息:
                                                                                                      A   
     If the person has stopped breathing, you must try to start his/her breathing at once. The best thing
is to use the mouth-to-mouth way. Lay the person down with his/her head lower than the rest of his/her
body and breathe into his/her mouth. If the person has something stuck in his/her throat, try to remove
it with your fingers, or by hitting him/her on the back.

                                                                           B    
     If the person is bleeding badly, you must try to stop the bleeding. Press on the bleeding point
with a piece of clean cloth and hold up the part of body which is bleeding. Bleeding from large
cuts may require immediate medical treatment.

                                                                             C
    If you are bitten and scratched by an animal, apply pressure to the area with a clean
bandage or towel until the bleeding stops, and then wash the cut under cold running water.
Cover the broken part if there is any, with a piece of clean cloth. Then see a doctor as soon
as possible.

D
    If you are hurt by fire or something very hot, cool the burnt part at once. Run cool (not cold) water
over the burnt part until it is less painful. Put a piece of dry clean cloth over the burnt part. If the area
is large, use a tub, shower or a garden hose.

E
    If there is a fire, never use a lift in the building because it’s very dangerous. The lift may get trapped
between floors. Use the stairs and leave the building at once. It is the safest way to leave the high
building when the fire happens.

F
    If some people have swallowed poison, they should be taken to a hospital at once. With some sleeping
pills, for example, it is a good thing to make the patient sick by pushing your fingers down his throat.
But if he has swallowed some kind of acid, or anything that burns, it would be a bad thing to make him
sick. The poison would burn his throat as it came up.

     以下是五人所遭遇的情况,请匹配适合他们的应对措施.
1．Liz is a housewife and lives in a high building. One day when she was cooking, she heard
some people crying "fire". A house near hers was on fire.
2．Anthony is a student journalist in the university. One day, he met a big black dog on his way
to an important interview. The dog bit him deeply.
3．Jeremy, a cook, sometimes cuts his hands during processing his food. But this time, he ate
mushroom carelessly which may be poisonous.
5．Lisa found a drowning man near a river. Someone had rescued him but he fell in a faint and
didn't breathe. How to help him?
5．Janet, a policewoman, often deals with some accidents. Today, she came to the scene of an
accident where a girl lying on the ground is bleeding. It seemed that she was badly hurt.
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