①中国坚持走和平发展道路,积极开展睦邻友好合作
②中国与大国或国家集团结盟来创造有利的国际环境
③维护世界和平、促进共同发展是我国外交政策的宗旨
④中国独立自主的和平外交政策得到了世界各国的认可
A:①③
B:②④
C:②③
D:①④
My Room
This is my room.It's nice and clean.You can see a ____ ,a ____ ,a ____ ,a ____ ,a ____ and a ____ in the room.There is a ____ on the wall. There are some ____ on the desk.There is a new ____ on the desk,too. I like my room.
身高突增是青春期的一个显著特点.(判断对错)
某种细菌直径约为0.00000067mm,若将0.000 000 67mm用科学记数法表示为6.7×10nmm(n为负整数),则n的值为( )