—The hazy weather has ________ for almost a week in North China.—Yes, and the government has tried to solve it.
A:finished
B:lasted
C:begun
D:passed
关于俄罗斯交通方面的叙述,正确的是( )
当白令海峡西侧为3月20日时,其东侧为( )
乒乓球从高空落下,到达地面后弹起的高度约为落下高度的0.4倍,若乒乓球从25米高处落下,那么弹起后再落下,弹5次时它的弹起高度是( )米.