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听力原文：One of the greatest public health successes, that is often unheralded, has been the massive decline in smoking rates, which are now translating into reduced deaths from cancer and heart disease.
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【参考答案】

公共健康方面的一大成果常为人所忽视即吸烟者比重的大幅下降现在这一现象使得又症和心脏病引起的死亡率也随之下降。
公......

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?Read this text taken from an article about some key aspects of operations management.?Choose the best sentence to fill each of the gaps.?For each gap (9-14), mark one letter (A-H) on your Answer Sheet.?Do not use any letter more than once.The Operations FunctionGoods are tangible items purchased by individuals or organizations for subsequent uses. Services are intangible items that are consumed when being provided, with the customer taking away or retaining the benefit of that service. But in many commercial situations, what is provided or produced by an organization can be a mixture of both goods and services. In some situations the product will outweigh the service but in other situations it will be the opposite.The operations function is the part of the organization that exists mainly to generate and produce the products. (9) .They have a conversion process, some resource inputs into that process, the outputs resulting from the conversions of the inputs, and theinformation feedback about the activities in the operations system. (10) . Economists refer to the transformation of resources into goods and services as the production function. (11) .This process is what creates the revenue for the company making the products or providing the services. (12) .When taking the conversion process into consideration we must take into account that the process is subject to random change and fluctuations. Unplanned or uncontrolled influences may cause the actual output to differ from the planned output. (13) .If there is a circumstance in which the Yangzi River of China was to flood, the production of rice would suffer, therefore causing an increase fluctuation in the price of rice. (14) .Fluctuations may also tend to be caused by internal problems inherent in the conversion process. Faulty equipment, material imperfections, and of course human errors are only a few of the ideas that affect output quality.
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Can you imagine that ice does not melt and is not wet? Have you ever heard of dry ice? Dry ice is made by freezing a gas. It is quite different from ordinary ice which is simply frozen water. Dry ice was first manufactured in 1925. It has since fulfilled the hopes of its inventor. It can be used for making artificial fog in the movies. When steam is passed over dry ice, a very dense vapor rises. It can also be used for destroying insects in grain supplies. It is more practical than ordinary ice because it takes up less space and it is 142 degrees colder. Since it turns into stream, instead of melting into water, it is cleaner to use. For these masons, it is extremely popular and many people prefer it to ordinary ice. Dry ice is so cold that if you touch it with your bare fingers, it will burn you.Dry IceTime of invention:【46】Uses: to make【47】in the movies;to destroy【48】Advantages over ordinary ice: takes【49】be【50】
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