We used to mistake that heavy objects fell faster than light .
A. the ones
B. those
C. ones
D. these
网友回答
A. the ones
B. those
(答案→)C. ones
D. these
解析：我们过去错误的认为重的物体比轻的落下来更快。这里需要代词指代objects，因为是泛指“轻的物体”，所以用ones泛指可数名词的复数，the ones是特指“可数名词复数”，those特指“可数名词复数”，these“这些”，所以选C。