A:Whoever
B:Who
C:Anyone
D:Those
蚕的丝腺细胞能产生大量丝蛋白,但不产生血液中血红蛋白,因此推测蚕的丝腺细胞
若直线mx+y-1=0与直线x-2y+3=0平行,则m的值为( )
一____were you when I was in town?
—In a village.