As used in the fifth sentence of the fourth paragraph, the word \”essentially\” means ______.
A) greatly
B) extremely
C) basically
D) necessarily
正确答案：C
答案：C
[试题分析]词义理解题
[详细解答]作者在提到圣安德里亚断层时用到了horizontal这个词而用vertical来形容新马德里断层而且通过转折短语ontheotherhand我们显然可以推断essentially近义于basically故答案为C
