1 Some experts are warning that the step the US government has taken to deal with the current crisis

题目

1 Some experts are warning that the step the US government has taken to deal with the current crisis between China and Japan is ___ of much risk.
A one B those C that D ones
2 -What do u think of the new comer to your office,Lily?
-Oh,it seems that his manner is ___ of a gentleman.
A one B that C it D what
第一题是选A,第二题是B,但是我觉得这两个地方不是一样的吗,为什么不同时填one或是that呢?

答案

A one=a step

C manner【行为、举止】为不可数.
英语中,常用one指代前面的单数可数,用that指代不可数,用those指代复数名词