—______ do you visit your grandparents?
— Every two weeks.
A:How often
B:How far
C:How long
D:How soon
生物的变异都是由环境引起的,不能遗传给后代。(判断对错)
制作某种机器零件,小明做220个零件与小芳做180个零件所用的时间相同,已知小明每小时比小芳多做20个零件.设小芳每小时做x个零件,则可列方程为 ____.
Dora has some shortcomings but ________ she seems like an intelligent,likable person. ( )
72-18=____
60-24=____
87-35=____
64+36=____
—It's so exciting that I _______ it twice.