11

　　hundreds of pounds of CO2 just by commuting by bicycle a few times a week.

　　Cycling is also good for your health. It can help you lose

　　12

　　, since it works the two biggest muscles of your body. Bicycling improves your cardiovascular（心血管的） health, which can

　　13

　　many diseases. Cycling burns calories and is a low-impact sport, meaning it carries a relatively low

　　14

　　of stress injury（应激损伤）, unlike running.

　　15

　　, bicycle commuting saves money. When you buy your first road bike, helmet, and accessories, you might be shocked by the

　　16

　　. But considering rising gas prices, you can save a(n)

　　17

　　amount of money each year by not driving a car.

　　You might be thinking, I don’t have

　　18

　　for bicycle commuting.

　　19

　　, you probably do. You could cut back on your TV time and pick up this activity that helps you get

　　20

　　, have fun, and care for the environment.

　　Cycling is very sensible. You can get in shape, save money, and help fight greenhouse gas emissions, all during your commute. How’s that for multitasking?

　　1. A. sad

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