阅读理解

　　Miss Evans taught physics in a London school．Last month she was explaining to her class about sound, and she decided to test them to see how successful she had been in her work．She said to them, Now, I have a sister in Washington．If I was calling her on the telephone, and at the same time you were 20 meters away and listened to me from the other side of the street, who could hear what I said earlier, my sister or you? And why?

　　The cleverest boy at once answered, “Your sister, Miss Evans, because electricity(电)travels faster than sound waves(波)．” That's very good, Miss Evans answered, but then one of the girls put up her hand, and Miss Evans said, Yes, Betty?

　　“I don't think so．Betty said, Your sister would hear you earlier because when it's eleven o'clock here, it's only six o'clock in Washington．”

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阅读下面短文，从短文后所给的四个选项中，选出可填入空白处的最佳选项．

　　Have you heard of the term“etiquette” And do you know that etiquette is not only a useful word 　　1　　 very useful to understand? Etiquette is not the same in every culture 　　2　　 in every situation．For example, standing very close to the person you are talking with is quite common in some Asian countries．However; if you do this in Europe, some 　　3　　 people might feel 　　4　　．Even in China, we all know that etiquette is not the same in all situations．Perhaps we think that talking loudly in our own homes is fine, but there are other places where talking loudly is 　　5　　．For example, most people would agree that talking loudly in a library, a museum, or a movie theater is 　　6　　．Even if you are with your friends, it is better to keep your voice 　　7　　 in public places．In fact, we should also 　　8　　 not to cough or sneeze loudly in public．

　　If we see someone 　　9　　 the rules of etiquette, we may politely give them some suggestions．Perhaps one of the most polite ways 　　10　　 ask someone, Would you mind doing this or Would yo mind not doing that．For example, if someone cuts 　　11　　 you in a line, you could ask them, Sorry, would you mind 　　12　　 the line? If someone is smoking on the busm you could ask, Excuse me, could you please 　　13　　 that cigarette? People don't usually like 　　14　　, so we have to be careful how we do this．

　　Although rules of etiquette can often be different, some rules are the same almost everywhere in the world! For example, 　　15　　 is almost never allowed．If you see someone you know doing this, you can ask them, Would you mind picking it up?

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