题目内容：
根据下列文章,请回答题。{PageRead the following text. Choose the best word(s) for each numbered blank and mark A,B ,C or D on ANSWER SHEET1.
Generally speaking, a British is widely regarded as a quiet, shy and conservative person who is _____21 only among those with whom be is acquainted. When a stranger is at present, he often seems nervous, _____ 22 embarrassed. You have to take a commuter train any morning or evening to _____23 the truth of this. Serious-looking businessmen and women sit reading their newspapers or dozing in a comer; hardly anybody talks, since to do so would be considered quite offensive.
_____24 , there is an unwritten but clearly understood code of behavior which, _____ 25 broken,makes the offender immediately the object of _____ 26
It has been known as a fact that a British has a _____27 for the discussion of their weather and that, if given a chance, he will talk about it _____ 28 . Some people argue that it is because the British weather seldom _____ 29 forecast and hence becomes a source of interest and _____30 to everyone. This may be so. _____31 a British cannot have much _____32 in the weathermen, who, after promising fine, sunny weather for the following day, are often proved wrong _____33 a cloud over the Atlantic brings rainy weather to all districts! The man in the street seems to be as accurate or as inaccurate as the weathermen in his _____ 34
Foreigners may be surprised at the number of references _____35 weather that the British make to each other in the course of a single day. Very often conversational greetings are _____36 by comments on the weather. "Nice day, isn' t it? Beautiful day !" may well be heard instead of "Good morning, how are you?" _____37 the foreigner may consider this exaggerated and comic, it is worthwhile pointing out that it could be used to his advantage. _____38 he wants to start a conversation with a British but is _____ 39 to know where to begin, he could do well to mention the state of the weather. It is a safe subject which will _____40 an answer from even the most reserved of the British. A．21．relaxed
B．frustrated
C．amused
D．exhausted
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