问题
选择题
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
答案
答案：C
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。