问题
单项选择题
电梯安装、改造和维修单位承担电梯的日常维护保养，应当达到国家（）标准的要求。
A.一般性
B.强制性
C.非强制性
D.试验
答案
参考答案：B
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电梯安装、改造和维修单位承担电梯的日常维护保养，应当达到国家（）标准的要求。
A.一般性
B.强制性
C.非强制性
D.试验
参考答案：B
“It’s raining cats and dogs!”Grandpa shouted. Little Richie came running to the window. He wanted to see the ____falling from the sky. He looked out of the window, but is was ____that there were no cats or dogs. He only saw small pools of water on the ground. “Man, it’s really coming down out there!” Uncle Bob agreed____he looked out of the window, too. Richie scratched his head(挠头). What was coming down? First they talked about cats and dogs that ____ be seen. Now someone said it “it”. What was going on with these ____? “Wow!” Aunt Susie shouted as she looked out of the window. “It’s raining really hard.” Richie____his aunt. “It is raining hard,” he agreed, “but ____are the cats and dogs?” Grandpa laughed. “Richie, that just____it’s raining really hard.” “So why didn’t you just say that?” Richie ____. It was irritating (恼人的) when people like they were not speaking English at all. “We did. You just didn’t understand these____.” Richie’s cousin said with a big smile. “Well, now I do.” Richie said.
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