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问题
单项选择题
当水泥混凝土垫层铺设在基土上，且气温长期处于0℃以下时，应设置( )。
A．伸缩缝
B．沉降缝
C．施工缝
D．膨胀带
答案
参考答案：
A
补全对话，情景问答
给下列的问句选择合适的答语。
( ) 1. What do you know?
( ) 2. What's the famous waterfall in Canada?
( ) 3. What are these?
( ) 4. What's the capital city of Canada?
A. Ottawa.
B. I know the flag is red and white.
C. It is Niagara Falls.
D. These are the Rocky Mountains.
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名词解释
喧嚣xuān xiāo
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