填空题

Children should learn more responsibility for their health through ______.

【参考答案】

classes in nutrition and aerobic exercise
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r n r n r n 1993 r n 1998 r n 2003 r n r n r n traveling outdoors r n 60% r n 72% r n 91% r n r n r n staying at home r n 40% r n 28% r n 9% r n r n r n total r n 100% r n 100% r n 100% r n r n 1．上表显示1993、1998、2003年人们的不同度假方式。请描述其变化 2．说明发生这些变化的原因 3．今后人们的度假方式还可能有怎样的变化
填空题
More than twice as many people had their blood cholesterol levels checked in 1990 as in 1983.
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