摘要： thin the ice is! It is dangerous to skate on it. A. What B. What a C. How D. How a
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根据对话内容补全单词。
A：It's ftartline 1 ndline today，isn't it?
B：Yes，but it's btartline 2 ndline warmer，Are you going s tartline 3 ndline?
A：Yes，I am．Look at that notice!What does it say?
B：It says the ice on the lake is thin．
A：It's dangerous to skate otartline 4 ndline the lake．I'm afraid we'd better tartline 5 ndline skate today．
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