问题 实验题

根据图所示的实验图,在一下面的空格处填入相应的内容。

(1) 甲图:通过真空罩可以看到手机来电显示灯在不断闪烁,说明电磁波              

(2) 乙图:利用这个实验原理可制作                                               

(3)丙图:口吹硬币跳过栏杆,说明                                              

(4) 丁图:音叉发出的声音不同,小球被弹开的幅度不同,说明                       

答案

(1)可以在真空中传播 (2)电动机 (3)气流速度大的地方压强小(4)声音响度和声音的振幅有关

手机放在真空罩中,听不到声音,说明声音不能在真空中传播,但能看到来电灯闪烁,说明手机能接收到电磁波。接通电源后电路中有电流通过,这时磁场中导体受安培力作用运动,此原理是电动机的工作原理。流体流动速度越大的地方,压强越小。声音有音色、频率和响度,不同的声音三个参数可能都不相同,振动幅度与响度有关,辨别声音是音色,频率决定声音高低。

阅读理解

As young students, you have many dreams. These dreams can be very big, such as winning the Nobel Prize; they can also be small, such as becoming one of the best students in your class.

Once you find a dream, what do you do with it? Do you ever try to make your dream real?

Andrew Matthews, an Australian writer, tells us that making your dreams real is life’s biggest challenge. You may think you’re not very good at some school subjects, or that it’s impossible for you to become a writer. Those kinds of ideas stop you from realizing your dream.

In fact, everyone can realize his dream. The first thing you must do is to remember what your dream is. Don’t let it leave your heart. Keep telling yourself what you want every day and then your dream will come true faster. You should know that a big dream is, in fact, made up of many small dreams.

You must also never give up your dream. There will be difficulties on the road to your dreams. But the biggest difficulty comes from yourself. You need to decide what is the most important. Studying instead of watching TV will help you to get better exam results, while saving five yuan instead of buying an ice cream means you can buy a new book.

As you get closer to your dream, it may change a little. This is good as you have the chance to learn something more useful and find new hobbies.

小题1:The biggest difficulty on the road to your dreams comes from _____________________.

A.yourself

B.your friends

C.your school

D.your parents.小题2:Which of the following isn’t mentioned in this passage?

A.You may think you’re not good at some school subjects.

B.Making your dreams real is life’s biggest challenge.

C.You must never give up your dream.

D.Listening to English more can help you realize your dream.小题3:.How do you make your dream come true faster?

A. Remember what your dream is.                B. Don’t let your dream leave your heart.

C. Keep telling yourself what you want every day.    D. A, B and C.

小题4: The best title (标题)of this passage is _________________________.

A.How to become a writer

B.How to make your dream real

C.A big dream is made up of small dreams

D.Everyone can realize his dream

多项选择题