问题 填空题

节日晚会上,口技演员惟妙惟肖地模仿一些生活中人们熟悉的声音,其实他主要是模仿声音的________。深更半夜,如果播放的音乐声很大,那么对邻居来说,此时的乐音就成为了________。

答案

音色,噪声

题目分析:声音有三个特征,即音调、响度、音色,音调是指声音的高低,响度是指声音的大小或强弱,音色是指声音的品质和特色.噪声有两种定义,从物理学角度看发声体做无规则振动时发出的声音叫噪声;从环保角度看凡是妨碍人们正常学习、工作、休息的声音以及对人们想听的声音起干扰作用的声音都叫噪声.不同的人发出声音主要是音色不同,所以口技模仿的是人的音色;从环保的角度看音乐声大影响了邻居的正常生活,所以是噪声.

点评:掌握声音的三个特征,包括定义、影响因素,在实际生活中能区分开;掌握噪声的两种定义方式,在实际生活中能区分出乐音还是噪声.

选择题
阅读理解

阅读理解。

     In northern China during spring big sandstorms often make trouble for people. Sandstorms usually

happen in spring. They have happened in more than 10 provinces in northern China this year. People in

southern China don't have to worry about this kind of bad weather. Most of the sand comes from the north

of China. In northern China, lots of places have few trees and don't get much rain. People there have been

cutting down too many trees. Where there aren't many trees, the ground can't keep enough water. Over

the years, the ground dries up and turns into sand. When spring comes and the ice melts, the ground

becomes loose (松的), and then strong winds take the loose sand into the sky.

      Sandstorms are bad for people's health. If people breathe too much sand, they could cough or have a

asthma (气喘). Sandstorms also bring farmers lots of problems. Sometimes their sheep get lost in the storms

and can't get back home. The winds also tear farmer's houses down.

     What can you do to stop sandstorms? Here's an idea-ask your parents to help you plant some trees this

spring. If you see people cutting down too many trees, tell them about the dangers of sandstorms and ask

your government to stop them.

1. Sandstorms usually happen in ______ China in ______.

2. If there are ______  trees and little water in a place over the years the sandstorm will come

      into ______ easily.

3. Sandstorms do ______ ______  people's health, farm land and farm houses.

4. In China, sandstorms appear mainly because people ______ ______ too many trees.

5. The way to stop sandstorms is to ______ trees and ______ people from cutting down trees.