问题补充：
Believe it or not, that is people call the sixth sense.
A. when
B. what
C. why
D. which
答案：
A. when
(答案→)B. what
C. why
D. which
解析：考查从句，call意思“把……说成……”，后面跟双宾语，所以从句people call the sixth sense缺少宾语，所以首先排除关系副词when/why，关系副词不做成份，只起引导作用，which作宾语时可以省去，what表示……的事或人，句子意思“信不信由你，那就是所谓的第六感”，所以选B
