问题补充：
This year there is rain and the trees are fruits.
A. a plenty of; abundant in
B. an abundance; abundant
C. an abundance of; abundant in
D. lots of; abundant
答案：
A. a plenty of; abundant in
B. an abundance; abundant
(答案→)C. an abundance of; abundant in
D. lots of; abundant
解析：考查词组：an abundance of大量的，be abundant in富含，句意：今年雨水很多，这些树结了很多果实。选C。
