抛一枚均匀的硬币,正面向上与向下的可能性均为50%,连投九次都是正面朝上,则第十次出现正面朝上的可能性是______.
1÷2×100%=50%.
故答案为:50%.
You should take _____ of this opportunity and try to make a good impression on them. [ ]
A. care
B. advantage
C. charge
D. place
一辆汽车2小时行80千米,平均每行1千米要______小时,平均每小时行______千米.