Bob and Sue are in the same school, 1 they are in different 2. They go to school on weekdays. 3 school, Bob and Sue often play games with 4 friends.

  Class begins 5 eight in the morning. Now Bob and Sue are in their own(自己的) classrooms. They are listening to their 6. Bob's studying English. His teacher is talking 7 English. Sue's 8 a Chinese class. Her teacher is talking 9 writing. They study hard. They love their teachers and they like their 10.

①团结友爱的体现

②在自觉履行公民的道德义务

③宪法和法律规定公民必须履行的

④在对自己的合法财产行使处分权。

蚕豆根尖细胞在含³H标记 的胞嘧啶脱氧核糖核苷酸培养基中完成一个细胞周期，然后在不含放射性标记的培养基中继续分裂至中期，其染色体的放射性标记分布情况是（   ）

在A人、B大地、C塑料、D金属、E油、F橡胶、G玻璃、H陶瓷、I盐水等物质中，通常情况下属于导体的是____ （选填序号），导电性能介于导体和绝缘体之间的物体叫做____ 。