对群落的结构和群落环境的形成有明显控制作用的植物种,称为( )。
A.伴生种B.优势种C.习生种D.劣生种
参考答案:B
肺气肿的病变中,下述哪一种是错误的()
A.肺泡间隔断裂
B.肺泡高度扩张
C.肺泡间隔胶原纤维增生
D.肺大泡形成
E.肺小动脉内膜增厚
China is a country _____ 56 different nationalities, among which Han _____ the majority of its population. [ ]
A. making up of; consists of
B. consisting of; makes up
C. made up of; consisting of
D. consisted of; making up of