关于月经产生机制不准确的为()
A.肾气盛
B.天癸至
C.情志舒畅
D.任通冲盛
E.血溢胞宫、月经来潮
参考答案:C
John with his parents _________ been in Australia for about two years.
A.have
B.has
C.are
D.is
被子植物的传粉方式分两种,桃花的传粉方式为( )
A.自花传粉
B.异花传粉
C.风力传粉
D.昆虫传粉