A good rest between classes recover brain power to its best and make us perform better in class later.
A. must
B. can
C. need
D. shall
网友回答
A. must
(答案→)B. can
C. need
D. shall
解析：考察情态动词用法。A必须，一定；B能够，可能；C需要；D将要；句义：课间良好的休息能够让大脑得到恢复到最好状态，让我们再接下来的课上表现更好。根据句义说明使用can，表示能够。故B正确。