在下面的五组数中:4,4,4,4;5,5,5,5;6,6,6,6;7,7,7,7;9,9,9,9.通过添上合适的运算符号(+、﹣、×、÷),使计算结果等于24那么满足条件的组数是( )
A:1
B:2
C:3
D:4
E:5
-- Is it to protect the earth against heavy pollution?
-- No, I don't think so. If everybody takes actions now, it will become better.
在地球的五带中,中国领土大部分位于( )
两个数4000000004和5000000005的乘积的各位数字和是____ .