问题
选择题
During _________ 3-day conference, global warming became _________ major concern of all the representatives.
A．the; a
B．a; the
C．the; \
D．a; \
答案
答案：A
本题考查冠词。the 3-day conference特指的3天的会议，故用the, a major concern一项关注的焦点，泛指，故选A。