单选题
The author explains that he will deal with reception of communication first because ______.
A、
communication actually takes place when the message is received
B、
there are more means of receiving than sending communications
C、
reception of communications involved use of the senses
D、
it is difficult to organize by type the means of sending communications
【正确答案】
D
【答案解析】
第二段第一句指出，发送信息的方式“are too numerous and varied for systematic classification”，由此可知D为正确答案。
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