阅读下列短文，从下面每小题的A、B、C、D四个选项中选出最佳选项。 Mr Brown is a famous doctor. He lives in Sydney with his wife and three children. His wife's father, Mr Black, lives with them too.
Mr Black is too old to work and he always sits in his chair near the bed all day; but in spring, if the weather is nice, he will sit outside. Sometimes, he even takes his chair into the garden if it is warm enough.
Recently, Mr Brown found that spending more than three hours playing outside every day can reduce a child's risk of becoming short-sighted. It challenges the people's belief that short-sightedness is caused by using electronic products or reading in weak light. Many people come to see Mr Brown and ask him why Mr Brown shows his research and believes that natural light has a special chemical which stops the eyeball from growing out of shape and prevents people from becoming short-sighted.
Mr Brown's oldest son, Andersen Brown, is twenty-seven. He is also a doctor like his father. He agrees with his father's idea and he suggests that everyone should spend some time outside. It doesn't matter that time is spent in travelling, playing sports outside or just sitting outside like his grandfather.
Mr Brown's oldest daughter, Wendy Brown, is twenty-four. She is a music teacher. She teaches students in a junior high school. She likes teaching very much. She thinks those teenagers are very lovely.
Mr Brown's youngest son, Mike Brown, is not old enough to go to work. He still goes to school. He is a very clever and hard-working boy. He is good at studying. He wants to be a scientist when he grows up.
