A. uses no electricity B. has a fire-safety shutoff C. docs not pollute the air in the house D. requires less insulation in house walls 参考答案:C 答案解析:本题询问该系统的优点。文中列举了五个优点,并有记号一一标出。与原文相比可 知,只有C项是属于优点之一的,原文为“Cleanliness—no combustion products, thus no
第27题: [单项选择]He was ______ for his years of service to the company with a grand farewell party and several presents. A. awarded B. rewarded C. warded D. safeguarded 参考答案:B 答案解析:[解析] award“授予,获奖”;reward“奖励,奖赏”;ward“避开,挡住”;safeguard“保护,护卫”。由题意可知正确答案为B。