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甲状腺功能亢进重症有（）
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海关对某经营加工贸易的企业进行稽查时发现，该企业1年内偷逃应缴税费累计达48万元人民币，因此该企业应属于B类企业。 ()
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。
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, ______.
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