根据图片从方框中选择合适的字母补全下列单词。

下列关于基因的说法，正确的是（　　）

Mr. Johnson worked in a hospital. Three years ago, when he was sixty-eight, he retired. But a lot of people come to ask him to look them over. He's very busy in the daytime and he wants to have a good rest at night.
Half a year ago a young man moved in the room upstairs. At first he was quiet. The old man was satisfied with him. But now he has several friends. They often came to see him in the evening. They talked loudly, sang and danced. Mr Johnson was unhappy, but he didn't say anything.
It was the young man's birthday yesterday. All his friends came at seven in the evening. They drank too much and made a lot of noise. The old man couldn't fall asleep the whole night. This morning, as soon as he got up, he went upstairs and began to knock at the door. The young man opened for him and asked him to come in.
"Did you hear me beat the ceiling(天花板) last night, young man?" asked Mr Johnson.
"It doesn't matter, sir," said the young man, "I don't mind it. It was very noisy in my room, too."

   Many people don’t think that the number 13 is a lucky number. Many hotels do not have a 13th floor. The floors go from 12 to 14, and there is no number13. Some people will never sit at a table with 12 other people. They will tell someone to go or ask another person to sit with them.
No one really knows why people do not like the number 13. Perhaps one reason is that when people began to count, they used ten fingers and two hands. This made 12. They could not count more.
   Some Christians (基督徒) say that 13 is not lucky because there were 13 people at a meal the day before Jesus (耶稣) was killed (被杀). In a story about the old Greek (希腊的) gods, 12 gods were asked to a meal but one more came. This made 13. It is why the god Balder, who was at the meal, was killed.