解析：选B　细节理解题。根据第二篇日记中的"We will take the train north, stay in Chiang Mai for two days, and then catch a bus to Chiang Rai."可知B项正确。

　　6．What is the best title for the whole diary?

　　A．My First Travel

　　B．The Outside World

　　C．Traveling in Thailand

　　D．My Trip to Chiang Mai

　　解析：选C　标题归纳题。根据全文内容可知，这是几篇到泰国旅游的日记，因此C项作标题最佳。

　　C

　　Parents can cut the chances of their children getting fat simply by keeping them longer at table. Just three minutes extra at a family mealtime could help prevent child obesity (肥胖). Research found that among poor families, the extra minutes at mealtimes made great improvement of a normal weight for the youth. The factors are likely to be communication and the importance of a scheduled mealtime.

　　Dr Barbara Fiese said, "Children, whose families have a 20­minute meal over four times a week, weigh less than kids who leave the table after 15 to 17 minutes. Over time, those extra minutes per meal add up and become really powerful."

　　The researchers studied 200 family mealtimes, testing the effects of factors and mealtime behavior of families with children in primary school. They found that families, who said that shared mealtimes were an important part of family life and had special meaning for them, were less likely to have an obese child. Similarly, families, who talked more together and interacted more positively during the meal, were more likely to have healthy­weight children.

　　Teaching low­income families how to make the most of family mealtimes was a wise idea. Dr Fiese said, "This is something we can target and teach." She added, "It's also important to recognize the increasing differences of families and their sometimes complex living arrangements that may challenge their abilities to plan ahead and arrange a single time to communicate with each other."

　　Families in poorer US neighborhoods faced a lot of problems, including poor access to healthy food. But even so, regular high quality family mealtimes made a difference to the children's weight. Dr Fiese said, "Three to four extra minutes per meal made a healthy weight more likely."

语篇解读：吃饭时适当延长进食时间到20 分钟对孩子们有好处，可保持健康预防肥胖。

7．According to the passage, to have a healthy­weight child, parents should________.