题目

根据短文内容，从短文后的16-20选项中选出能填入空白处的最佳选项，其中有两项是多余选项。 How is dining in space different from eating on Earth? Spacesuits? Check! Oxygen? Check! Water? Check! Are we forgetting something? Food! If you send astronauts into space, you have to send along food as well. But what do astronauts eat, and how do they eat it? First, and possibly most important, is nutrition (营养). Maintaining the astronauts' physical health is a top task for any space mission. Providing junk foods to eat, such as potato chips, sodas, and pizza, would make the astronauts feel unhealthy. If the food that has been provided is distasteful, then the astronauts may avoid eating it. If you've ever tried to concentrate on something important while your stomach doesn't feel well, you'll know why the scientists in charge of a space mission want their astronauts to eat regularly. The lack of gravity in a spacecraft also determines what foods can or cannot be eaten in space. Meals must be packaged carefully so they won't spill into the cabin. Liquids or tiny bits of food could get inside a machine or electronic device and damage it. __ A loose knife bouncing (弹起) around inside the cabin would be dangerous. The weight of every object included in a spacecraft must be calculated in order to ensure that there is enough fuel and power to carry the craft safely into space and home again. Most foods are stored in plastic bags, and often, the foods are dehydrated (脱水). When an astronaut is ready to eat, hot water is added to rehydrate the meal and warm it up. Despite all these requirements, much of the food eaten in space is actually similar to what you might eat on any given day. A. Variety and taste are also important. B. Finally, weight is an important concern. C. Food packaging is made to be as light as possible. D. Believe it or not, they also have fresh fruits and vegetables. E. Nutrition and practicality are important things to consider. F. For the same reason sharp utensils are never used onboard. G. Scientists take several factors into consideration as they plan meals for space. 答案：【1】G【2】A【3】F【4】B【5】C

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