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新生儿第一次接种乙肝疫苗的时间是（）
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优生基因工程主要是“优中选优”,而这种“优化”必然使人类基因走向单一性,不会给我们的后代带来生存方面的麻烦。()
Communication comes from the Latin cornrnunis, common. When we communicate we are trying to establish a "commonness" with someone. That is, we are trying to share information, an idea, or an attitude. At this moment I am trying to communicate to you the idea that the essence of communication is getting the receiver and the sender "tuned" together for a particular message. At this same moment, someone somewhere is excitedly "phoning" the fire department that the house is on fire. Somewhere else a young man in a parked automo bile is trying to convey the understanding that he is overwhelmed because he loves the young lady. Somewhere else a newspaper is trying to persuade its readers to believe as it does about the Republican Party. All these are forms of communication, and the process in each case is essentially the same.
Communication always requires at least three elements — the source, the message, and the destination. A source may be an individual or a communication organization(like a news paper, publishing house, television station or motion picture studio). The message may be in the form. of ink on paper, sound waves in the air, impulses in an electric current, a wave of the hand, a flag in the air, or any other signal capable of being interpreted meaningfully. The destination may be a discussion group, a lecture audience, a football crowd, or a mob; or an individual member of the particular group we call the mass audience, such as the reader of a newspaper or a viewer of television.
Which of the following statements is NOT true about "communication"？
以下说法正确的是()
克隆本身是一种低级的生殖方式,生物进化的层次越低,越有可能采取这种生殖方式。()
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