第1题: [单项选择]具有激活淀粉酶作用的离子是() A. 钾离子 B. 钠离子 C. 氯离子 D. 钙离子 E. 镁离子 参考答案:C 答案解析:很多阴离子有激活淀粉酶的作用,其中以氯离子、溴离子为最强。
第2题: [单项选择]The prodigal son spent his money extravagantly and soon after he left home he was reduced to a beggar. A. lavishly B. economically C. thriftily D. extrovertly 参考答案:A 答案解析:extravagantly挥霍无度地;lavishly浪费地;economically经济地,经济学地;thriftily节俭地;extrovertly性格外向地。