A. They knew organic produce was in demand. B. They wanted to grow their own food. C. They had been trained in organic farming. D. They had moved together to the country. 参考答案:B 答案解析:从文章第二段第三句“The land here had never been intensively farmed，it was all permanent pasture，and in the ea
第14题: [单项选择]某单位利用业余时间组织了3次义务劳动，总计有112人次参加。在参加义务劳动的人中，只参加1次、参加2次和3次全部参加的人数之比为5:4:1。问该单位共有多少人参加了义务劳动? A. 70 B. 80 C. 85 D. 102 参考答案:A 答案解析:解析
3次义务劳动共计112人次参加，其中只参加1次，参加2次和3次全部参加的人数之比为5∶4∶1。设设只参加一次的人数为5x人，则参加2次的为4x人，参加3次的为x人。根据三集合容斥原理公式可
第26题: [单项选择]某医院总建筑面积6000m2，建筑高度28.5m。地上七层，地下一层（其中地下一层为车库，建筑面积1100m2）。该建筑物设有消火栓和自动喷水灭火系统，采用临时高压给水，请回答以下问题：消防水箱不应小于（） A. 6m3 B. 12m3 C. 18m3 D. 24m3 参考答案:C
第32题: [单项选择]Questions 11 to 18 are based on the conversation you have just heard. A. The boy’s mother has had an accident. B. The boy’s mother doesn’t know of his condition. C. The boy’s mother is in serious condition. D. The boy’s mother has received the news. 参考答案:B 答案解析:[听力原文] M: Is the boy who had the accident in serious condition W: I’m afraid he is, but they’
