Write a multi-choice question for the following article: Article: Everyone knows that exercise is important.We all need to _ .Doctors say it is good for us.it makes your heart and body _ .When the daytime comes, we must get up. This is the time for exercise. Exercise means doing things with the body. Children who often exercise are more alert .This means they do better in tests and schoolwork than those who don't exercise. There are _ ways to exercise.You can walk, run, swim, skate, or play ball games, Make sure you exercise in the following ways:you have to like what you're doing. Exercise enough but not too much.it's best to exercise _ each week .Thirty minutes each time is enough.Try all kinds of thing until you find one, two or even three sports that feel right for you. You can exercise at _ .They have a lot of equipment there. The equipment will help exercise your arms, legs and other parts of body to make you fit.Some people buy equipment for their homes.But it is very expensive. Exercising can be fun.Friends can exercise together at a fitness center, or they can Play sports together.How do you exercise?
The answer to this question is:
Question: How long should we do exercise is do it _ .Options:A An hourB Half an houC 20 minutesD 40 minutesAnswer:B