问题
单项选择题
我国的《公路沥青路面再生技术规范》建议水泥等活性填料一般不超过（）
A.1%
B.1.5%
C.2%
D.2.5%
答案
参考答案：B
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我国的《公路沥青路面再生技术规范》建议水泥等活性填料一般不超过（）
A.1%
B.1.5%
C.2%
D.2.5%
参考答案：B
| 根据对话内容，选择适当的句子补全对话。 | |
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| A: What's this in the picture? B: 1 A: Oh,I see. 2 , families put up Christmas trees in their living rooms, don't they? B: Yes. 3 A: And what's this at the top of the tree? B: 4 A: What's under the tree? B: 5 |