问题 填空题

某同学按图所示进行实验,当喇叭发声时,可观察到肥皂液膜会出现振动现象,由此现象得出的结论是______.

答案

喇叭发声时,肥皂膜会振动,是因为获得了能量.喇叭振动发出声音,声音通过空气向肥皂膜传递,使得肥皂膜振动,肥皂膜获得的能量是由声音传递过来的,所以该实验说明声音可以传递能量.

故答案为:声音可以传递能量.

阅读理解

Will it matter if you don’t take your breakfast? A short time ago, a test was given in the United States. People of different ages, from 12 to 83, were asked to have a test. During the test, these people were given all kinds of breakfasts, and sometimes they got no breakfast at all. Scientists wanted to see how well their bodies worked when they had eaten different kinds of breakfasts.

The results show that if a person eats a right breakfast, he or she will work better than if he or she has no breakfast. If a student has fruit, egg, bread and milk before going to school, he will learn more quickly and listen more carefully.

The result is opposite to what some people think. Having no breakfast will not help you lose weight. This is because people become so hungry at noon that they eat too much for lunch. They will gain weight(增加体重) instead of losing it. You will lose more weight if you reduce your other meals.

小题1:During the test, the people were given ________.

A.no breakfast at all

B.different foods or nothing

C.very rich breakfast

D.little food for breakfast小题2:The results show that ___________.

A.breakfast has great effect (影响) on work and studies

B.breakfast has little to do with a person’s work

C.a person will work better if he only has fruit and milk

D.girl students should have little for breakfast小题3:According to the passage, some people think that if you don’t have breakfast you will _____________.

A.be healthier

B.work better

C.lose weight

D.lose your way小题4:The word “reduce” in the last sentence means _______.

A.增加

B.减少

C.放弃

D.享用小题5: Which of the following is not right?

A.It is bad for your health to have no breakfast.

B.Too little for breakfast and too much for lunch may make you fatter.

C.If you don’t eat much for lunch and supper, you may lose weight.

D.The more breakfast you have, the more quickly you’ll learn in class

单项选择题 A2型题