问题补充:
Our teachers are really . They often work in their office far into the night.
A. open-minded
B. hard-working
C. self-confident
D. warm-hearted
答案:
A. open-minded
(答案→)B. hard-working
C. self-confident
D. warm-hearted
解析:考查词义辨析。open-minded心胸开阔的,hard-working 勤劳的,self-confident 自信的,warm-hearted 热心肠的,句意:我们真得很勤劳。他经常在办公室工作到深夜。所以选B。