问题
选择题
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
答案：B
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。