关于青蛙生殖发育的特点,叙述正确的是[ ]
A.体内受精,卵生,变态发育
B.体外受精,卵生,非变态发育
C.体外受精,胎生,变态发育
D.体外受精,卵生,变态发育
答案:D
We were all surprised when he made it clear that he _____ office soon.
A.leaves
B.would leave
C.left
D.had left
《中国药典》(2000年版)二部规定:薄膜衣片全部崩解的时限为
A.10min
B.15min
C.25min
D.30min
E.60min