A:every day; every day
B:every day; everyday
C:everyday; everyday
D:everyday; every day
如果(x+1)(x2﹣2ax+a2)的乘积中不含x2项,则a=____
夏天正午,烈日当空,小勇给庭院里的花草洒水,他认为这样可以保护花草,而爸爸却说这样做不妥.果然,水珠蒸发以后,花草叶上出现了一个个焦黄的斑点,这是被高温灼伤的原因,为什么?
Keep the windows ____ (open), please. It's a little hot in the room.