German scientists say that eating a little chocolate every day may keep you away from cardiovascular(心血管的) disease. The scientists have found that chocolate, especially dark chocolate , can help you cut down 39 percent of heart disease, including taking a very small amount . However, the study advises people not to eat too much chocolate, because too much chocolate is bad for our bodies. So the scientists advise people to eat small amount of chocolate instead of sugar or high-fat snacks.
Scientists said, “Dark chocolate shows the greatest effects, milk chocolate fewer , and white chocolate no effects.” The results showed chocolate may cut down blood pressure, but they also say that further study is needed.
In the eight-year study, people’s daily diet, exercise habits, and blood pressure were studied in 19,357 persons aged 35 to 65. They found that people who are an average of 7.5 grams of chocolate a day had a very lower chance of heart disease than those who ate much less chocolate , and average of 1.7 grams a day.
【小题1】It took the scientists __________ years to prove that small amount of chocolate is good for people.

Mr. and Mrs. Harris had always spent their summer holidays in a small hotel at the seaside near their hometown. One year, however, Mr.  Harris made a lot of money in his factory, so they decided to go to a foreign country and stay at a really good hotel.

They flew to Paris, and arrived at a 5-star hotel late in the evening. They thought they would have to go to bed hungry, because in that small hotel where they used to stay in the past, no meals were served after seven in the evening. They were surprised to be told that the hotel served dinner until ten.

"Then what are the times of meals?" asked Mrs. Harris.

"Well, Madam, we serve breakfast from seven to eleven, lunch from twelve to three, tea from four to five, and dinner from six to ten."

"But that hardly leaves any time for us to see the city!" said Mrs. Harris.

1.Why did Mr. and Mrs. Harris think they would have to go to bed hungry when they arrived at the hotel?

2. How long did the service time for lunch last in the hotel?

3. What did Mrs. Harris think of the times of the meals in the hotel?

Mr Knight was the manager of a hotel. One weekend all of the hotels in the city were 36_____ because there was an important meeting. On Friday night, three men came into the hotel and asked for rooms. Mr Knight said that there were 37_____ rooms ready for use because of the meeting. The three men were very 38____ because they had no place to stay.
Mr Knight wanted to help them. He remembered that Room 418, a very small room, was empty. He asked the men 39____ they would share a room. The three men said they would.
Mr Knight told that the room would be thirty dollars: ten dollars 40_____ each one. Each man gave him ten dollars, and then they went up to the room.
Mr Knight soon began to feel 41_____. “Thirty dollars is a lot to ask as a price for that small room.” He thought. He said to his assistant, “Here’s five dollars. Give it to the men in Room 418. I asked them too 42______money for their room.”
The assistant tool the money. 43____ he was on the way to Room 418, he started to think: “How can three men divide five dollars? I’ll keep two dollars. The men will be happy to get anything back. I’ll take a little money and Mr Knight will 44_____ know.” So the assistant returned one dollar to each man.
Each man had paid ten dollars. After the assistant returned one dollar to each one, each man had 45_____ paid only nine dollars. There were three men ＄9×3=＄27. The assistant kept ＄2. ＄27+＄2=＄29. Where is the missing dollar?