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    Sometimes it may seem difficult to improve our health.If so，the following health habits may help you.

·Eat breakfast every morning.

    Research shows that if you eat a meal in the morning you may not become too fat or eat too much during lunch.Eating breakfast can help people feel better through the day.

·Get enough sleep.

    Poor sleep can influence our memory and learning.It can also cause traffic accidents！Studies show that people who don't get enough sleep seem to get into more accidents.So stay safe and get enough sleep!

·Take a walk every day.

    Walking is an easy way to exercise.You'd better meet friends for a walk，not for a meal.As you walk，you will see the beautiful world around you.Once you try，you will find that adding a walk into your daily life is very easy.

·Join social groups.

    Social groups can provide support.They might include sports teams，art or music groups.People in the group can offer advice and can help each other in difficult times.Also，being in a group keeps your mind busy.An active mind is a healthy mind!

·Have a hobby.

    A hobby could be running，reading or making something with your hands.Hobbies help people to relax and rest.Hobbies bring us joy as well.

如果从一卷粗细均匀的电线上截取1米长的电线, 称得它的质量为a克，再称得剩余电线的质量为b克, 那么原来这卷电线的总长度是(     )