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is diet.Japanese people are some of the longestliving people on the planet, with women up to 87 years old and men up to 80. The Japanese diet is the reason for such lengths of life. The diet has many foods that are low in calories and high in nutrients. Japanese people eat a lot of seaweed, tofu, rice, vegetables and fish. The tradition there is to stop eating when your stomach feels 80 percent full.However, French people eat fatty foods but do not get fat. And they live a long time. This phenomenon is called the “French Paradox.” The reason why the French eat fatty foods without getting fat may be simple. They eat less. Serving sizes in French restaurants and in product sold in stores are smaller than those in most countries. And generally speaking, most French people do not snack. This means they do not eat food between meals.28. What do we know about the healthiest diets around the world?A. They contain abundant calories. B. They tend to be expensive.C. They share certain similarities, D. They reflect popular tastes.29. What is considered as a harmful eating habit in Japanese tradition?A. Going low in calories. B. Eating to the fullest.C. Having much seafood. D. Picking many foods.30. How does the author develop the central idea in the last 4 paragraphs?A. By building connections. B. By exploring reasons,C. By listing out examples. D. By analyzing figures.31. Which can be the most suitable title for the text?A. What is the healthiest diet on earth? , B. How does the old expression serve?C. Why is a healthy diet so important? D. Where can we plant ourselves well? DWomen are friendly. But men are more petitive. Why? Researchers have found it39。s all down to the hormone oxytocin(荷爾蒙催生素). Although known as the love hormone, it affects the sexes differently.Women tend to be social in their behavior. They often share with others. But men tend to be petitive. They are trying to improve their social status, said Professor Ryan.Generally, people believe that the hormone oxytocin is let out in our body in various social situations and our body creates a large amount of it during positive social interactions such as falling in love or giving birth.But in a previous experiment Professor Ryan found that the hormone is also let out in our body during negative social interactions such as envy.Further researches showed that in men the hormone oxytocin improves the ability to recognize petitive relationships, but in women it raises the ability to recognize friendship. Professor Ryan39。s recent experiment used 62 men and women aged 20 to 37. Half of the participants received oxytocin. The other half received placebo (安慰劑). After a week, the two groups switched with participants. They went through the same procedure with the other material. Following each treatment, they were shown some video pictures with different social interactions. Then they were asked to analyze the relationships by answering some questions. The questions were about telling friendship from petition. And their answers should be based on gestures, body language and facial expressions.The results indicated that, after treatment with oxytocin, men39。s ability to correctly recognize petitive relationships improved, but in women it was the ability to correctly recognize friendship that got better.Professor Ryan thus concluded: Our experiment proves that the hormone oxytocin can raise people39。s abilities to better distinguish different social interactions. And the behavior differences between men and women are caused by biological factors that are mainly hormonal. 32. What causes men and women to behave differently according to the text?A. Placebo. B. Oxytocin.