阅读理解。
People from other countries will find many different surprising things in Britain.
Greek: A man from Greece sees a special way of driving in Britain. People drive on the left in the British
street, but the British people never feel surprised. The Greek man said,"I've been in Britain for nearly a month
now. But at first, I couldn't always remember to drive on the left. Every time, my friend reminded me."
Japanese: Japanese people can't understand why British people keep their shoes on at home. In Japan,
people walk in the room without shoes. If visitor keeps his shoes on at home in Japan, the Japanese people
think he is very impolite.
Spanish: The Spanish people mind the way that the British people greet each other. They themselves seem
to be afraid of touching (接触).When they meet, they just smile or nod but never kiss or hug (拥抱) in Spain.
But the British people think kissing is a very usual greeting when they meet!
There is an old saying, "When in Rome, do as Romans do."When we go to a foreign country, we should
follow the etiquette of country.
1. The Greek visitor _______.
A. always drives on the left
B. used to drive on the left
C. drove correctly in Britain with his friend's help
2. _______ think it's impolite to wear shoes at home.
A. The Japanese
B. The Greek
C. The English
3. When greeting, the Spanish _______.
A. kiss each other
B. hug each other
C. smile at each other
4. _______ seem not to be afraid of touching each other.
A. The Spanish
B. The British
C. The Japanese
5. Etiquette in the world _______.
A. is the same
B. is important
C. is sometimes different and interesting
,由题意，质点1开始振动方向向上，而乙图上质点1振动方向向下，并且传播了一个波长后第一次通过平衡位置向下，所以
，解得
，AD错误，波速
,故C正确，B错误，