A recent report details the health benefits of walking. The report found that walking regularly to fulfill the 150 minutes of moderate physical exercise every week, recommended by the UK's chief medical officer, could save 37,000 lives each year. Scientists at the Lawrence Berkeley National Laboratory in California found that quick walking reduces the risk of heart disease more effectively than running. They observed participants aged between 18 and 80 over a six­year period and found that walking reduced the risk of heart disease by 9.3%, while running reduced it by 4.5%. And there is even more good news: 30 minutes of quick walking over five days could help you sleep easily, according to research by Oregon State University. The study by the university showed that walking helped participants sleep better and feel more alert during the day.

　　The sooner you get started, the sooner you'll notice the differences in your mind and body. So, go out for your 30­minute walk in a nearby park or green space.

　　1.The underlined word “humble” in the first paragraph probably means “________”.

　　A.plainB.relaxing

　　C.popular

　　D.active

　　2.What does Jolynn Jaekel think of walking?

　　A.It's loved by people of all ages.

　　B.It's much healthier than running.

　　C.It's a money­saving physical exercise.

　　D.It's becoming more and more popular.

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