问题
单项选择题
当昼夜平均气温低于（）℃或最低气温低于-3℃时，采取保温措施，并按冬季施工处理。
A.4
B.5
C.6
答案
参考答案：B
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当昼夜平均气温低于（）℃或最低气温低于-3℃时，采取保温措施，并按冬季施工处理。
A.4
B.5
C.6
参考答案：B
Mr Clarke works in a middle school. He likes reading and often ____ some books from the library. He ____ to the radio every morning and reads ____ after supper. So he knows much and teaches well. His ____ worship(崇拜) him very much. Mike, Mr Clarke’s little son, is only nine. He _____ likes reading books. And he often asks his father some questions. Mr Clarke always thinks he's too ____ to understand him and chooses ____ ones to answer. Of course the boy is not satisfied with(对…满意) it. One day Mike read ____ about the electric lights (电灯) and was ____it. When his father told him to do some housework, he went on thinking of it. He asked him __10__ questions, and his father answered all. Then his father said proudly, “Fathers always know ____than sons!” The boy thought for a while and said, “____” “Oh? Why?” Mike didn’t answer and asked, ____, “Who invented the electric lights?” “____.”answered Mr Clarke. “Why didn't his father invent them, then?” Looking at his son, Mr Clarke didn't know _____ to answer!
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