问题补充：
--- What a beautiful city our hometown is! There are many trees of the road!
--- Yes, and of the trees is growing larger and larger.
A. on both side; a number
B. on each sides; a number
C. on both sides; the number
D. on every side; the number
答案：
A. on both side; a number
B. on each sides; a number
(答案→)C. on both sides; the number
D. on every side; the number
解析：本题的含义是在道路的两旁有许多树，树的数量在逐步地变得越来越多。表示在两边，both后跟复数sides，而each后应跟单数side，故不选ABC，the number of表示……的数量，而a number of表示许多的意思，与题意不符，故本题选C。
