如图所示电路，电源电压恒定，滑动变阻器R₁的最大阻值为20Ω．当S₁、S₂均闭合且滑片P滑到滑动变阻器的最右端时，电流表A₁、A₂的示数分别为1A和0.2A；当S₁、S₂均断开且滑片P置于滑动变阻器的中点时，电流表A₁的示数为0.4A．可知电阻R₂的阻值为____ Ω，整个电路消耗的最小电功率为____ W．

下面文章中有五处需要添加小标题。请从以下选项(A、B、C、D、E和F)中选出符合各段意思的小标题。选项中有一项是多余选项。

    Take time to care for yourself. ChooseMyPlate. gov helps you choose the kinds and amounts of food and drinks you need. And, make time to be physically active, so you can do the things you want to do.

Find out what you need.

    Get personalized nutrition(营养) information based on your age, height, weight, and physical activity level. SuperTracker provides your calorie(卡路里) , shows foods and beverages you need, and tracks progress toward your goals. Learn more at www. SuperTracker. usda. gov.

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    Use a smaller plate at meals to help control the amount of food and calories you eat. Enjoy smaller amounts of food.

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    Add fruit to meals as part of main or side dishes. Choose red, orange, or dark-green vegetables like tomatoes, sweet potatoes, and broccoli, along with other vegetables for meals.

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    Sip water or other drinks with few or no calories to help maintain a healthy weight. Keep a water bottle in your bag or at your desk to satisfy your thirst throughout the day.

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    Set a goal to fit in at least 2.5 hours of physical activity in your week. Being active 10 minutes at a time also adds to your weekly total. Ask your friends or family to keep you company as you bike, jog, walk, or dance.

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    Try out healthier recipes that use less fat, salt, and sugar. Eat at home more often to control your eating. If you eat out, check and compare nutrition information. Choose healthier options such as baked chicken instead of fried chicken.

读下面“中国略图”，完成下列问题
。
填出图中序号所代表的地理事物名称：
（1）山脉：② ____ ③____   
（2）河流： ④____ ，由河流流向判断我国地势特征是____ 。
（3）省区： ⑤____ 地形区： ⑥____ 高原A____ （国家），C____ 海。