Doctors should take special care when treating children because their breathing rate is different from of adults.
A. one
B. those
C. that
D. some
网友回答
A. one
B. those
(答案→)C. that
D. some
解析：考查代词。 that代替的是the breathing rare；特指成年人的“呼吸率”。That特指前面所提到的不可数名词或可数名词单数。