How many states the United States? Fifty.A. turn upB. make upC. end upD. give up

问题补充：

How many states the United States? Fifty.

A. turn up

B. make up

C. end up

D. give up

答案：

A. turn up

(答案→)B. make up

C. end up

D. give up

解析：句意：美国有多少个州组成？五十个。A. turn up出现； B. make up 组成 C. end up 最终 D. give up 放弃 。根据句意和词组的固定搭配，故选B。