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不知是假冒专利产品而批发购进，事后得知实情，为避免损失而予售出的行为，视为侵犯专利权的行为。()
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对于不具备设置会计机构和配备会计人员条件的单位，应当委托合法的中介机构代理记账。()
A向B签发一张支票，B背书给C，C又将该支票背书给D，C在该支票上注明“不得转让”。但D又将该支票背书至E，E又背书至F。C只对D承担票据责任。()
Rocket fuels are more explosive than methane gas because of ______.
Part A
Directions: Read the following four texts. Answer the questions below each text by choosing A, B, C or D. (40 points)
A classic series of experiments to determine the effects of overpopulation on communities of rats was conducted by a psychologist, John Calhoun. In each experiment, an equal number of male and female adult rats were placed in an enclosure. The rat populations were allowed to increase. Calhoun knew from experience approximately how many rats could live in the enclosures without experiencing stress due to over crowding. He allowed the population to increase to approximately twice this number. Then he stabilized the population by removing offspring that were not dependent on their mothers. At the end of the experiments, Calhoun was able to conclude that overcrowding causes a break down in the normal social relationships among rats, a kind of social disease. The rats in the experiments did not follow the same patterns of behavior. as rats would in a community without overcrowding.
The females in the rat population were the most seriously affected by the high population density. For example, mothers sometimes abandoned their pups, and, without their mothers' care, the pups died. The experiments verified that in overpopulated communities, mother rats do not-behave normally. Their behavior. may be considered diseased, pathological. The dominant males in the rat population were the least affected by overpopulation. Each of these strong males claimed an area of the enclosure as his own. Therefore, these individuals did not experience the overcrowding in the same way as the other rats did. However, dominant males did behave pathologically at times. Their antisocial behavior. consisted of attacks on weaker male, female, and immature rats. This deviant behaviour showed that even though the dominant males had enough living space, they too were affected by the general overcrowding.
Nondominant males in the experimental rat communities also exhibited deviant social behavior. Some withdrew completely, avoiding contact with other rats. Other nondominant males were hyperactive, chasing other rats and fighting each other.
The behaviour of the rat population has parallels in human behavior. People in densely populated areas exhibit deviant behavior. similar to that of the rats in Calhoun's experiments. In large urban areas, such as New York City, London, and Cairo, there are abandoned children. There are cruel, powerful individuals, both men and women. There are also people who withdraw and people who become hyperactive. Is the principal cause of these disorders overpopulation？ Calhoun's experiments suggest that it might be. In any case, social scientists and city planners have been influenced by the results of this series of experiments.
Calhoun stabilized the rat population ______.
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