上市公司在其股票暂停上市期间，可以不履行上市公司的有关义务。( )
参考答案：错
解析： 股票暂停上市期间，仍要履行上市公司的有关义务。
Task A has the following details：Optimistic estimate=30, pessimistic estimate=40, most likely estimate=35. Task B has the following details：Optimistic estimate=32, pessimistic estimate=37, most likely estimate=34. Task C has the following details：Optimistic estimate=25, most likely estimate=35, pessimistic estimate=45. Which task has the highest standard deviation （）
A. Task A.
B. Task B.
C. Task C.
D. Task A & Task C.
蒲公英的种子像“小伞”，苍耳的种子，果实上有刺，这属于（）
A.遗传和变异
B.地理隔离
C.生存斗争
D.生物的适应性
