今天做了一道题,是这样写的

今天做了一道题,是这样写的
21.Global warming causes sea-level rises by...
a:increase ocean temperature,resulting in expansion of ocean volume
b:melting floating sea-ice at Arctic Ocean,resulting in increase in the total amount of water in ocean
c:melting of glacier at high mountain and at Antarctic and Greenland,resulting in increase in the total amount of water in ocean.
答案是选a和c,但我总觉得b也没有错啊,可能是不是怀疑会不会增加水的总量,但我又觉得没有问题.既然c对了,b也对啊...疑惑中...