You'd better not speak of it at the beginning of the story, ________ it may give away the surprising

ending.[ ]

A. otherwise  

B. then

C. so 

D. which

美国第一大河密西西比河最后流入哪个海湾？（）

A.几内亚湾

B.波斯湾

C.墨西哥湾

D.孟加拉湾