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模拟声音数字化存放是通过采样和量化实现的，若采样频率为1kHz，每样本16位，存放一分钟双声道的声音约占()M字节存储空间。
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代理报关企业如果有违反海关监管规定的行为，海关暂停其一年的报关权。 ()
Forests have always been useful and important to man who make use of them in many ways. Every day trees are serving man everywhere. Trees supply man with fruits and building materials in the form. of wood. Without trees it would be impossible to build houses, boats, bridges and so on. Furniture such as desks, chairs and beds is made of wood. Trees can stop man from terrible heat. They're also useful in preventing good and rich top soil from being washed away during heavy rains.
If there were no trees, heavy rains would wash away the rich top soil that is so important to plants. The result is that the land will become a desert. There are plenty of desert areas in the world. A long time ago these desert areas used to be very rich areas, but man in the past had not enough knowledge about science of nature, they cut down too many trees in the area where they lived and never planted new ones. By and by the rich top soil was blown and washed away by strong winds and heavy rains. In the end the rich land changed into useless deserts where nothing could grow.
According to the passage, ______.
听力原文： I wasn't in school yesterday. I was absent. I was visiting my grandparents. They have a beautiful farm in the country. The farmhouse is beautiful too. It's not very big, but it's very nice. My mother was born there. My grandfather was born there, too.
My grandparents are getting old now, but they're still working. My grandfather is about sixty. He's still farming. My grandmother is still taking care of the house. She is a very good cook. I always have a good time there. I always like to see my grandparents and I like to eat, too — especially grandmother's cookies.
Why wasn't the author in school yesterday？
【B14】
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