Scientists generally agree that the earth's climate will warm up over the next 50 to 100 years

Scientists generally agree that the earth's climate will warm up over the next 50 to 100 years ________ it has warmed in the 20 000 years since Ice Age.

A.so long as

B.as much as

C.as long as

D.as well as

答案及解析： B

解析：

这是一个表示同级比较的比较状语从句，因比较的对象是上升的温度，所以B项最佳。句意：科学家普遍认为，在未来的50年到100年间，气候将要变暖，其幅度相当于自冰川期至现在2万年间的气候变化。