青蛙的生殖方式是[ ]
A．体外受精，卵生
B．体外受精，变态发育
C．体内受精，卵生
D．体内受精，变态发育
答案：A
—Are you pleased with what he has done?
—It couldn’t be ________ . Why didn’t he put more effort into his work?
A．any worse
B．much better
C．so bad
D．the best
简要分析人的职业发展道路包括哪些方面？
