***思想被确立为***的指导思想是在（   ）

    Do you want to be healthier? Then go through the passage, and you may find it's easy ____fit.

    1).Eat all kinds of foods, especially fruits and vegetables.

    You may have a favourite kind of food, but the best____is to eat as many kinds as possible. If you eat ____ foods, you're more likely to get the nutrients your body needs. Taste new foods that you____ tried before. Some foods, such as green vegetables, are very important. Have five servings(份) of fruits and three vegetables.

    2)Drink water and milk often.

    When you are really ____cold water is the No. 1 choice. Kids need calcium(钙) to grow strong, and milk is a great source of this mineral (矿物质) . How much do children____? About three glasses of milk every day.

    3) Limit screen time.

    What's screen time? It's the ____for watching TV, DVDs, and videos,____

computer games, and using the computer. If you spend much time ____ these activities, you may have less time left to take ____ such as playing basketball, bicycling, and swimming.

A种饮料比B种饮料单价少1元，小峰买了3瓶A种饮料和4瓶B种饮料，一共花了18元．如果设B种饮料单价为x元/瓶，那么下面所列方程正确的是   （   ）