问题 多项选择题

伽利略在研究力与运动的关系时成功地设计了理想斜面实验,关于理想实验说法中正确的是()

A.理想实验是建立在经验事实基础上的合乎逻辑的科学推理

B.理想实验完全是逻辑思维的结果,不需要经过客观事实的检验

C.理想实验抓住了客观事实的主要因素,忽略次要因素,从而更加深刻地揭示了自然规律

D.理想实验所提出的设想在现实生活中是不可能出现的,因此得出的结论是没有价值的

答案

参考答案:A, C

阅读理解

阅读理解。

     People know the dangers of fires. It 's good for a family to learn how to prepare for a fire. Here are

some suggestions:

     Put a smoke alarm in the house. Smoke from a fire causes the alarm to go off. The alarm makes a

loud sound. The sound tells everyone to leave the house at once.

   Make escape plans. They should know all the ways out of the house. If there is a fire, everyone follows

the plan to get out. Part of the plan is to check all the windows to make sure they can be opened easily.

   Buy fire extinguishers in the house. Everyone in the family should know how to use them.

   Practice for a fire. They do fire practice because they teach children about fire safety. Everyone in the

family should know the following fire rules:

    ●Don't open a hot door! The fire can grow more quickly if you open the door.

    ●Stay close to the floor! Smoke can be more dangerous than fire.

    ●The best air is near the floor because smoke rises.

    ●What will you do if your hair or clothes start to burn? First, stop!

    Don't run! The fire burns faster because of more air, Drop! Fall to the floor. Then roll! Turning over a

nd over will make the fire go out. Put a blanket  (毯子 ) around you to keep air away from the fire that

may still be on you.

   There are many possible causes for fires. A wise family is ready alt the time. If there is a fire, don't

forget to call 119 for help.

l. What does it mean when a smoke alarm rings at home?   

A. You have to get up.

B. Water is running to the floor.

C. Something is burning.

D. Someone breaks your window.

2. The writer advises people to do the following to  prepare for a fire except that ______. 

A. they practice for a fire

B. they make escape plans

C. they buy fire extinguishers

D. they use electrical cookers

3. When a fire happens, ______ if you open the hot door.  

A. the fire will grow more quickly

B. the electricity will be cut off

C. the door will soon be on fire

D. the house will fall down

4. What are the right steps you should take when your hair or clothes catch fire?  

A. Stop, run, roll.    

B. Stop, drop, roll.

C. Run, drop, roll.    

D. Roll, drop, stop.

5. What is the best title for this passage?    

A. The Dangers of a Fire.

B. The Causes of a Fire.

C. Learn to Use a Fire Extinguisher.

D. Be Ready for a Fire.

单项选择题