题目内容：
根据以下资料，回答题：Generally speaking, a British is widely regarded as a quiet，shy and conservative person who is__21__0nly among those with whom he 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 corner；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___．
I t 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 rmny 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 com—ments 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．relaxed
B．frustrated
C．amused
D．exhausted
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