The aythorities who_______one to fill up forms, frequently demand answers to questions that one would hesitate to put to one's intimate friends.
A.require
B.request
答案是A 选B为什么不行？？request也有“要求”的意思啊！？

遇到这种容易混淆的词，若要透彻理解个中的意思，就不能仅仅依靠中文的解释，一定要去查英文词典。先看看英文词典中，这两词作为及物动词且用在“要求”时的解释：

Request：
* to ask for, esp. politely or formally: He requested permission to speak.
* to ask or beg; bid (usually fol. by a clause or an infinitive): to request that he leave; to request to be excused.
* to ask or beg (someone) to do something: He requested me to go.

Require：
* to call on authoritatively; order or enjoin to do something: to require an agent to account for money spent.
* to ask for authoritatively or imperatively; demand.
* to call for or exact as obligatory; ordain: The law requires annual income-tax returns.

从中可看出，request多偏重请求，恳求之意，而require多偏重要求、甚至命令之意，常用在权威机构发出号召或命令时。

在此句中，The aythorities （拼错，应是authorities） who_______one to fill up forms。。。第一个词就是权威机构，要求人们填表。。。所以用require。

这两词除了“要求”外还有其它意思，不在此讨论范围之内。