问题
选择题
Doing morning exercise is of great ____________ to your health & consequently you’d better keep on it.
A．benefit
B．beneficial
C．benefition
D．useful
答案
答案：A
be of +名词相当于形容词的作用。本题中be of benefit相当于be beneficial。句意：做早操对你的健康很有益你最好坚持。