阅读理解。
Jim is a very busy 8-year-old boy. He is good at many kinds of sports. It is easy to see that Jim is very active after school. In contrast(相比之下), while most American children are in school, they have a PE class just (A)每周一次 for 45 minutes. Boys and girls from Grade 1 to Grade 12 do not have to exercise.
Not all American children are (B) as active in sports after school as Jim is. Therefore, these boys and girls need to exercise in school. Many people believe that (C)美国孩子们的健康 is in trouble. In fact, 40% of children aged 5 to 8 may be unhealthy already. For example, many are overweight. Doctors believe that these are the results of physical inactivity and poor diet (饮食).
In many countries in the world , all schoolchildren have to do one hour of exercise every day. These exercises do not have to be team sports.(D) They may not be difficult , such as running or jumping. Doctors believe that habits learned early are more probable to stay with us all our lives. School is the good place to learn these habits , or practices. Active , healthy children who exercise often can become active, healthy adults(成年人)
1.将划线（B）译成英语。
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2.将划线（C）译成汉语。
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3.将划线（D）译成英语。
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4.将划线（E）改写成： _____________they _____________difficult, such as running or jumping.
5. According to (根据) this article , what kind of children can become active, healthy adults(成年人)?
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