“作茧自缚”说的是蚕发育过程的哪个时期 [ ]
A．卵
B．幼虫
C．蛹
D．成虫
答案：C
若x2+2x的值是6，则5-3x2-6x的值是______．
. Which do you think tastes _______, Millie, the chicken or the fish?
A．bad
B．the worse
C．worse
D．the worst
