问题
单项选择题
相邻填层使用不同种类或颗粒条件的填料时，其粒径应符合D15/d85≤（）（两层渗水土间）或D15≤0.5mm（非渗水土与渗水土间）的要求。否则，两层之间应铺设隔离作用的土工合成材料。
A、3
B、4
C、5
答案
参考答案：B
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相邻填层使用不同种类或颗粒条件的填料时，其粒径应符合D15/d85≤（）（两层渗水土间）或D15≤0.5mm（非渗水土与渗水土间）的要求。否则，两层之间应铺设隔离作用的土工合成材料。
A、3
B、4
C、5
参考答案：B
| 完形填空 | ||||
| A generation gap (代沟) has become a serious problem. I read a 1__ about it in the newspaper. Some children have killed themselves after quarrelled with _2 .I think this is because they don't often have a talk with each other. Parents now 3 more time in the office, 4__they don't have much time to stay with their children. As time passes, they both feel that they don't have the _5 topics to talk about. I want to tell parents to be more with your __6_ , get to know them and _7 them. And for children, show your __8__ to your parents. They are the people who love you. So _9_ them your thoughts. In this way, you can have a _10 understanding of each other.
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