A:实行***领导的多党合作和政治协商制度
B:国家机构实行民主集中制原则
C:坚持党的领导、人民民主和依法治国的统一
D:是人民民主专政的社会主义国家
用括号内所给单词的适当形式填空
(1)—Is Grace your aunt?
—Yes, ____ (her) is.
(2)Mike and Bob ____ (be) friends.
(3)His ____ (grandparent) are in Beijing.
(4)These are her ____ (sister).
(5)—Are ____ (this) your pencils?
—No. My pencils are not black.
下列选项中,可以看作是一个生态系统的是( )