昆虫的发育可分为两个阶段，第一阶段是（），第二阶段是（）。
参考答案：胚胎发育；胚后发育
London will be the 30th city _____ holds the Olympic Games.[ ]
A. where
B. that
C. which
D. what
-- Xiao Wang, ______ will it take to fly to Guangzhou?
-- Sorry, I don’t know.
A. how long B. how soon C. how far
