①显示出我国是推动建立国际新秩序的主力军
②表明国际援助是解决人道主义危机的根本之道
③体现了我国在国际事务中发挥着建设性作用
④表明我国积极承担与国际地位相适应的责任
A:①②
B:①③
C:②④
D:③④
(____) It's so big!
(____) It has a short tail.
(____) It's an elephant.
(____) It has a long nose.
(____) It has big ears.
胚胎在母体内发育的场所是( )