A:Hello!May I speak to Tom, please
B:Speaking. [16]
A:This is Bill. I called you yesterday, but youwere not at home.
B:[17]I need to prepare something for my tripto Shanghai.
A:ShanghaiThat’s where the World Exposition(世博会)is being held. How lucky you are!
B:So I am. [18]
A:I, have a birthday party next Friday. Wouldyou like to come
B: [19]My plane will take off next Wednesday.
A:What a pity(遗憾)that you can’t come![20]
B:Thank you very much. Bye!
A:Bye!
A．Who’s that
B．I’d like to, but I’m afraid I can’t.
C．I’m buying something for my aunt.
D．Have a good trip!
E．I was shopping at that time.
F．Who are you
G．What did you call me for

青蛙和菜粉蝶的发育都是变态发育。下列有关叙述，正确的是 

A．它们在发育过程中都要进行蜕皮

B．它们都属于有性生殖，其受精卵都在水中发育

C．它们的幼体和成体在形态结构与生活习性上都有很大的差异

D．它们在变态发育过程中都经历了受精卵、幼体、蛹和成体四个时期