E．Common sense tells us that students need to get enough sleep to perform well in school.

　　F．But the relationship between phones and grades is not simple.

　　G．Another relationship has been noticed between increased time on cell phones and decrease in physical activity.

　　答案：1～5.AFGDC

　　D

　　(2016·兰州高三诊断)One of the best ways to change your looks and improve your health is to lose excessive weight.There are plenty of tips，hints and various techniques to help you cope with the problem.

　　Say good­bye to sugar

　　1．________.Sugar is added to most products to make them more addictive.People like the sweet taste and get used to eating pretty soon.Do not use sugar at all or minimize its amount while cooking.

　　Enjoy fruits and vegetables

　　来源：ziyuanku.comEating fruits and veggies is absolutely necessary when you are on a diet and need minerals，vitamins and other nutrients to stay energetic and alert.2.________.Because we tend to snack on fast food instead.In order not to get bored with vegetables and fruits，be creative and invent something new，such as colorful salads or smoothies.

　　Get enough sleep

　　It has been scientifically proved that people who do not get enough sleep eat more.3.________.It is stressful for the whole organism to stay up late at night.Go to bed before midnight.Avoid snacking on fatty and sugary foods before bedtime.Stop drinking caffeinated drinks a few hours before you go to bed so that you could fall asleep easier.

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