Mr. Wang _____ gets up early. So he is ______ late for work.
A:always; always
B:never; never
C:always; often
D:always; never
当实验室光线较暗时,显微镜的调节宜为
抛物线y=ax2+bx+3经过点A(1,0)和点B(5,0).
“落红不是无情物。化作春泥更护花。”是这首诗的精华所在。请自选一个角度(或语言,或诗意,或情感,或哲理)写一段鉴赏性文字。(40字以内)