单选题
The newly discovered fault was extraordinary because
A、
it caused a severe local earthquake in the past.
B、
it pushes older rocks on the top of younger rocks.
C、
it has three segments and covers a relatively large area.
D、
it was hidden beneath California's largest city.
【正确答案】
B
【答案解析】
新发现的断层之所以特殊，并不是因为A(在过去曾弓I起地震)、C(由三部分组成而且覆盖面甚广)、D(深藏在加州最大的城市下面)，这些都很平常，而是因为它的特殊结构与众不同，原文中的reversing the normal pattern很说明问题。
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