口算我最快(玩转加减法):
10-1=____ 11-2=____ 12-3=____ 13-4=____
2+10=____ 3+9=____ 4+8=____ 5+7=____
在常温条件下不能完成的化学反应或实验是( )
Last year was the warmest year on record, with global temperature 0.68 ℃ ____ the average.