Cars do cause us some health problems--in fact far more serious ___________ than mobile phones do.
A. one B. ones C. it D. those
Key:B
怎样选择those和ones,要方法，只要能做对题目就好
one作代词的考点。
it：特指上文提到的同一个事物或人（同类、同物、特指）；
例句：I bought a new camera . I will lend it(the camera) to you.
one：泛指与上文提到的事物是同一类的事物中的某个，但不是上面的事物（同类、异物、泛指）,切one只用来代指可数名词单数；
例句：I have lost my pen and have to buy one.
ones：是one的复数；
例句：I want some roses ---red and white ones.
that：特指与上文提到的事物同类，但不是同一物体（同类、异物、特指），可用来代指可数名词单数或不可数名词；
those：是that的复数
当代指可数名词单数时，the one 与 that可互换，但当代指不可数名词时两者不可互换；
the ones= those。
所以此题的关键是看特指还是泛指，一般有限定性定语修饰的表特指。如何知道是特指呢？特指的时候 the one 的后面一般会有关系从句（如定语从句）、介词短语、不定式短语对the one 进行修饰。
例句：1、The film is more interesting than the one(that) we see the other day.（有定语从句修饰）
2、those actors were better than the ones in the former play.(介词短语修饰）
3、I'm not the one to adminish him.(不定式修饰）
it：特指上文提到的同一个事物或人（同类、同物、特指）；
例句：I bought a new camera . I will lend it(the camera) to you.
one：泛指与上文提到的事物是同一类的事物中的某个，但不是上面的事物（同类、异物、泛指）,切one只用来代指可数名词单数；
例句：I have lost my pen and have to buy one.
ones：是one的复数；
例句：I want some roses ---red and white ones.
that：特指与上文提到的事物同类，但不是同一物体（同类、异物、特指），可用来代指可数名词单数或不可数名词；
those：是that的复数
当代指可数名词单数时，the one 与 that可互换，但当代指不可数名词时两者不可互换；
the ones= those。
所以此题的关键是看特指还是泛指，一般有限定性定语修饰的表特指。如何知道是特指呢？特指的时候 the one 的后面一般会有关系从句（如定语从句）、介词短语、不定式短语对the one 进行修饰。
例句：1、The film is more interesting than the one(that) we see the other day.（有定语从句修饰）
2、those actors were better than the ones in the former play.(介词短语修饰）
3、I'm not the one to adminish him.(不定式修饰）
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第1个回答 2012-05-05
that／those和one／ones的区别：
1.one与that虽可用来指代同名异物, 但one为泛指, 相当于a／an＋名词; that为特指, 相当于the ＋名词。所以one所指代的名词的修饰语一般为 a／an ／some ／any; that所指代的名词的修饰语往往是the ／this ／that。
2. one只能代替可数名词单数, 代替可数名词复数时用ones; that既可以代替不可数名词也可以代替可数名词单数, 代替可数名词复数时用 those。
I like this pen more than that one. （one代替可数名词单数pen）
There were a few young people and some older ones in the house. （ones代替可数名词复数people）
Mary's handwriting is far better than that of Peter. （that代替不可数名词 handwriting）
These pictures are more beautiful than those. （those代替可数名词复数 pictures）
1.one与that虽可用来指代同名异物, 但one为泛指, 相当于a／an＋名词; that为特指, 相当于the ＋名词。所以one所指代的名词的修饰语一般为 a／an ／some ／any; that所指代的名词的修饰语往往是the ／this ／that。
2. one只能代替可数名词单数, 代替可数名词复数时用ones; that既可以代替不可数名词也可以代替可数名词单数, 代替可数名词复数时用 those。
I like this pen more than that one. （one代替可数名词单数pen）
There were a few young people and some older ones in the house. （ones代替可数名词复数people）
Mary's handwriting is far better than that of Peter. （that代替不可数名词 handwriting）
These pictures are more beautiful than those. （those代替可数名词复数 pictures）
第2个回答 2012-05-13
ones必须和形容词连用。如果替代的名词时无形容词在前，则用some, any，而不用ones。例如：
Have you bought any rulers? 买尺了吗？
Yes, I 've bought some. 买了，买了几把。
those后边可以跟限定性定语从句：Those who couldn’t walk were carried on stretchers．那些不能走的人都用担架抬着。
......
Have you bought any rulers? 买尺了吗？
Yes, I 've bought some. 买了，买了几把。
those后边可以跟限定性定语从句：Those who couldn’t walk were carried on stretchers．那些不能走的人都用担架抬着。
......
