问题
单项选择题
关于Word 97工具栏，说法正确的是( )。
A．工具按钮就是命令菜单中的某些常用命令
B．使用工具按钮与使用菜单命令的效果不同
C．工具栏的位置不能移动
D．工具按钮表示命令菜单中没有命令
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
关于Word 97工具栏，说法正确的是( )。
A．工具按钮就是命令菜单中的某些常用命令
B．使用工具按钮与使用菜单命令的效果不同
C．工具栏的位置不能移动
D．工具按钮表示命令菜单中没有命令
参考答案：A
Stop. Listen! What do you hear? You may hear many different sounds. Some of those sounds may be noise. Noise is a loud or unwanted sound. Noise can be caused by many kinds of machines, such as motorcycles, jet planes, farm tractors(拖拉机), rock music is also noise. What happens to people who live near noisy machines or use them over a period of time? Doctors have found that these people have trouble in sleeping. But, most important, constant(不断的) loud noise can cause a loss of hearing. Scientists use a unit of measure called decibel(分贝) to measure the loudness of a sound. The sound of a quiet room, for example, measures 35 decibels. Talking measures between 40 and 65 decibels. Sounds from traffic and from some rock bands can measure over 120 decibels. Noise at this high level(层次) causes the great hearing loss. 根据短文内容，选择正确的答案（每小题1分，共5分） 小题1:According to the passage, noise is .
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