大家做XDF补充题的时候有没有发现答案有错的时候？

3.                 It can be inferred from the passage that if the S waves from an earthquake arrive at a given location long after the P waves, which of the following must be true?fficeffice" />

(A) The earthquake was a deep event.

(B) The earthquake was a shallow event.

(C) The earthquake focus was distant.

(D) The earthquake focus was nearby.

(E) The earthquake had a low peak intensity.

如果题干中的a given location 是epicenter的话，那么A是对的。

问题是，无法确定这一点。

如果a given location 在水平距离上离epicenter很远，

那么即使The earthquake was a shallow event

也有可能出现题干中所指的情况