沟鞭藻属于()。
A.裸藻门
B.甲藻门
C.绿藻门
D.褐藻门
参考答案:B
几乎全部位于大洋上的板块是( )
A.太平洋板块
B.亚欧板块
C.印度洋板块
D.美洲板块
Sorry to have kept you waiting for so long.()
A.Not at all
B.Don 't say so
C.I don't think so
D.It doesn't matter