A. it is an effective substitute for ordinary smoking B. it has no side effects C. it avoids second-hand smoke D. it can prevent a fire from bursting out 参考答案:B 答案解析:本题为细节归纳题。据第5段第1句可排除D。据第5段最后1句可排除A;据第9段第1句可排除C。
第30题: [单项选择]His new girlfriend had {{U}}omitted{{/U}} to tell him that she was married. A. forgotten B. failed C. deleted D. left out 参考答案:B 答案解析:omit:疏忽,遗漏。fail:失败;没有能够。He failed to understand the real significance of it. 他没有理解它的真正意义。forget:忘记。I