We have two kinds of summer camps for your holidays. You can choose based on your own int

问题补充：

We have two kinds of summer camps for your holidays. You can choose based on your own interests.

A. either

B. each

C. all

D. it

答案：

(答案→)A. either

B. each

C. all

D. it

解析：根据two kinds of summer camps，表示两者中的任何一方，用either， all 表示三者或三者以上都，each指三者或三者以上的人或物中的每个，而it指上文提到的某样东西，故选A。