Do you know the girl over there? She wears a hat with flowers on it. Her name is Xinzi. She is a nice Japanese girl, my new friend. She is in our class, studying Chinese.

I like Xinzi. I don’t know Japanese, and Xinzi doesn’t know much Chinese. We know some English. We are the same age. And we have the same interests. We like to sing Chinese, Japanese and English songs. I help her to ride a bike and fly a kite. She helps me to swim and jump. We like playing football, but we can’t play at school because the playground is small. Xinzi and the other girls in our class will go to the swimming pool on Monday, and I want to go with them.

小题1:What does the girl know?

A．Much Chinese.

B．Some English.

C．Little Japanese.

D．Nothing.小题2:What is Xinzi good at?

A．Swimming and jumping.

B．Riding a bike.

C．Flying a kite.

D．Playing basketball.小题3:Xinzi and the other girls want to ______ on Monday.

A．play games

B．go swimming

C．play football

D．fly kites

某主干道污水管道工程，设计采用直径700mm的HDPE高密度聚乙烯双壁波纹管.在沟槽开挖中，由于施工员未交代清楚，结果槽底挖深了20cm左右，施工员发现后，立即安排用挖出的土回填至设计高程.管道工程施工完毕后不到一个月发生沟槽位置沉陷，经查管道内部无明显问题.管道使用一年多时间后，发现有检查井四周沉降，井盖破损，管道塌瘪现象，造成排水不畅，需要返工。

规范规定：沟槽胸腔及管顶以上（）范围内填土时，应做到分层回填，两侧同时进行回填夯实，高差不得超过30cm，回填土中不得含有碎石、石块及大于10cm冻土块，管座混凝土强度达5MPa以上方能回填。

A.30cm

B.40cm

C.50cm

D.60cm