"His symptoms had been textbook" means that his symptoms wereA．part of the textbook.B．no l
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"His symptoms had been textbook" means that his symptoms were
A．part of the textbook.
B．no longer in the textbook.
C．recently included in the textbook.
D．explained in the textbook.
请帮忙给出正确答案和分析，谢谢！
更新中~-
正确答案：D
语义题。由题干定位至第十一段。该段第三句中的冒号后面指出“heavyperspirationandshortnessofbreathdespiteclearlungs”，即大量出汗、呼吸困难但肺部清晰，这是教科书对这种症状的记载，该段第二句则说明了这种症状的成因，而第四句提到“Ihadn"treadthatchapterinthetextbookyet”，即“我”还没有读到教科书的这个章节。综合看来，这种症状背后的成因在教科书里有所解释，作者之所以不知道，是因为还没有读到此处，故[D]为答案。