已知平面α与β所成的二面角为80°，P为α、β外一定点，过点P的一条直线与α、β所成的角都是30°，则这样的直线有且仅有[ ]

A.1条

B.2条

C.3条

D.4条

A．It was great. B．what’s the matter C．How about the green one
D．Are you free tomorrow E．Thanks, but I am full.

A: So many nice coats! I can’t decide which one to buy.
B: ______