Many people like eating meat so much that they can't enjoy a single meal without it． After seeing a new study， they may want to change their eating habits．

Scientists at the Harvard School of Public Health have found that having too much red meat can cause a higher risk of early death． These "dangerous" meats are the ones that look red before they're cooked， such as pork， beef and rabbit． Scientists published the study results in a medical magazine．

The scientists studied the eating habits and health of more than 110，000adults for more than 20years． They did a survey on their diets every four years． During the 20years of research， almost 24，000people died， including 5，910from heart disease and 9，464from cancer．

Scientists examined different lifestyle factors（因素），including age， weight， physical activity and family history of heart disease． They also studied the amount of different foods they ate， such as corns， fruits， vegetables and fish．

The results showed that eating one meal a day of cooked red meat was connected with a 20percent higher risk of early death．

"The message we want to communicate is it would be great if you could lower your intake of red meat to half a serving（一份）a day or two to three servings a week，"the study's lead author， An Pan told the USA Today．

51． From Paragraph 1， we know that　　．

A． eating meat is bad for health

B． some people eat meat for almost every day

C． the new study is about the eating habits of some people

52． According to the text， what do we know about the study？　　

A． It took the scientists more than 20years．

B． Almost 24，000people died from heart disease．

C． The scientists did the survey every five years．

53． The purpose of this study is to ask people to　　．

A． eat less red meat

B． change their lifestyle

C． cook red meat in healthy way

54． If you have half a serving of red meat a day or two to three servings a week， you will　　．

A． get ill

B． put on weight

C． lower the risk of early death

55． This text is　　．

A． a story

B． a science report

C． an advertisement