8.CA根据新定义,NA就是具体的6.02214076×103个基本单元,不确定度被消除,故A正确;B.标准状况下,11.2LO2与N2组成的混合气体,含有原子个数约为NA,而常温常压下,温度高于0℃,11.2LO2与N2组成的混合气体,含有原子个数小于NA,故B正确:C.未说明重氢化物DTs的具体质量,无法计算中子数,故C错误;D.60.0gC3H4O的物质的量为1mol,C3HO存在多种同分异构体,若是醚类物质,则含有的C-C键为NA,若是醇类物质,则含有的CC键为2NA,故D正确

B【语篇导读】本文是一篇记叙文,介绍了一为遗遇车祸的妻子祈福的马路天使。24.B细节理解题。根据文章第一段第行“M6 mmy was just in a car accident.”可知。故25.D推理判断题。根据障第三段最后一句“ she had continued to pray for our family”可知 <成面d26.b细节理解题。根据文章第一段前几句话“ the phone rings.‘hlo’, daddy,it'sme.it' s alyce,my12- year-old daughter.‘ mommy was just in a car accident.’”可知alyce rang her dad;根据文章第一段最后一句话“ i dash to spot.”可知doug rushed scene;根据文章的第三段“ alyce told that she needed call me,so woman lent phone.”可知 susan phone;根据文章的第三段第一句话“ and were at an event celebrating martin luther king jr.”可知they attended celebration;根据文章的第三段“ our temple' cantor(领唱) musicaldirector, danny, up us. he said excitedly, theres here tonight fromone of church choirs who you have meet! returned with african americanwoman bright, glowing smile. "n] *l they introduced africanamerican woman:根据文章的最后一段可知 each other after takinga picture。故选b。27.c词义猜测题。根据文章第一段可知作者的表子遭遇了车祸,再根据第三段最后一句“ accident,…”故选c。端< p>

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