问题补充:
At school we take exercise for an hour every day to build us up.
A. cheer us up
B. make us happy
C. change us
D. make us stronger
答案:
A. cheer us up
B. make us happy
C. change us
(答案→)D. make us stronger
解析:句意:在学校我们每天锻炼一小时来强壮身体。Build up加强;A使我们振作;B让我们高兴;C改变我们;D让我们更强壮;故D符合题意。