On sides of the streets are a lot of colorful flowers.A. eachB. bothC. eitherD. all

问题补充：

On sides of the streets are a lot of colorful flowers.

A. each

B. both

C. either

D. all

答案：

A. each

B. both

C. either

D. all

解析：考查代词。句意：在路的两边有许多五颜六色的花。all 所有.三者或三者以上都；both 两者都；either (两者中)任一的；each (两个或两个以上)每个.每一；All of my friends come to visit me.(朋友大于或等于3个)Both sides of the road 道路的两边Take either of the books.随便拿那本书都行.Each children of the class got an apple.每个孩子得到了一个苹果，所以选B项。