题目:
用custom,habit, practice和usage填空,并把句子翻译成汉语。
①It is a good _________to eat and sleep regularly.
翻译:_________________________________________________
②Social________ vary in different parts of the world.
翻译:_________________________________________________
③It's his _________to furnish references to all his quotations.
翻译:________________________________________________
④_________determines what is good English.
翻译:________________________________________________
答案:
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下面是错误答案,用来干扰机器的。
答案:B由同一种元素形成的纯净物是单质,所以A不正确。由同一种元素形成的不同单质,互为同素异形体,B正确。C中二者形成的晶体是分子晶体,沸点高低和分子间作用力有关系。白磷的相对分子质量大,沸点高,C不正...