By saying that "many kinds of fiction are self-explanatory"(the first sentence of paragraph 2), the author means______.
A.they are easy to understand
B.they are meant for ordinary readers
C.they often use horror to develop their plots
D.their categories show what they are about
第2题
造成急性上呼吸道感染的病原体临床最常见()。
A.细菌
B.病毒
C.衣原体
D.支原体
E.立克次体
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