题干

关于声现象,下列说法正确的是(  )

A:声音既可以传递信息,又可以传递能量

B:不能听到真空罩中闹钟的闹铃声,是因为闹钟发出的闹铃声响度太小

C:声音传播的速度与温度无关

D:城区内某些路段禁止汽车鸣笛,是为了从声音的传播途中控制噪声

上一题 下一题 0.0难度 选择题 更新时间:2018-06-19 10:07:07

答案(点此获取答案解析)

A

同类题2

阅读短文,根据要求完成下面各小题。

    China had one of the earliest civilizations(文明) in the world. ⑶We know the Chinese had a written language as early as 1500 BC. You can see that Chinese writing is very different from the writing in other countries. The Chinese use a different character for each word. People in many countries have to learn only 26 letters but people in China have to memorize about 600 characters before they can do even basic reading and writing.

    A man in China, named Confucius(孔子), was teaching the people of China what they should and should not do. He was a great wise man. His teachings filled several books and became a way of life for the Chinese, and many other people in Asia. Confucius taught that people should listen to their kings, and also that rulers should take care of their people. He taught people to listen to their parents and teachers and to be kind to others. He said, “⑷Don't do to others what you would not want others to do to you.”

    Many inventions were made and used in China before the rest of the world even heard of them. By 600 AD the Chinese had invented printing. After a few centuries, they made the compass, which was a great help to sailors. A compass can tell north from south. The Chinese were the first to discover how to make explosive powder(火药).

    From all this, you can see that the Chinese were very busy making things that the rest of the world found really exciting and helpful when people learnt about them.

⑴⑵根据短文简要回答问题;⑶⑷将短文中划线的句子译成汉语;⑸请给短文拟一个适当的标题。