(1)二氧化碳含量增高（2）南北极冰层融化（3）地球气温升高（4）工业化程度加剧（5）海水淹没大片陆地

A．（3）（4）（2）（1）（5）

B．（2）（5）（3）（1）（4）

C．（4）（1）（3）（2）（5）

D．（4）（3）（2）（1）（5）

If you were being assisted by an icebreaker and he sent you the single letter Q，he would be telling you（）.

A.that he has his engines in reverse

B.that he is shortening the distance between vessels

C.to shorten the distance between vessels

D.that his vessel is healthy