They’re          little sheep that I      look after them carefully all day.

A．too, should

B．such, have to

C．so, must

D．such, ought

通常热带气旋的移动路径经常出现明显蛇行特征的阶段是（）

A.转向前

B.转向时

C.转向后

D.A.B.C都对