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关于上消化道双重对比造影检查前准备，正确的是
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Living SpaceHow much living space does a person____? What happens when____space needs are not____? Scientists are doing experiments on____to try to____6____of overcrowded conditions on man. Recent ____have shown that the behavior of ____is greatly affected by space. If rats have enough living space, they eat well, sleep well and produce their ____well. But if their living conditions become too crowded, their behavior and even their ____change ____. They can not sleep and eat well, and ____of fear and worry become clear. The more crowded they are, the more they tend to ____each other and even kill each other. ____, ____17__, populations and violence are directly related. Is this a natural law for human society as well? ____enough space not only ____, but necessary for human survival? ____are interesting questions.
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