D．regularly get free stickers and emoticons

　　解析：选C　细节理解题。根据WhatsApp (US)部分的“It's noted for its accessibility, ease of use and the absence (没有) of adverts.”可知，WhatsApp的一个受人欢迎的特点就是没有广告，故选C项。

　　C

　　(2016·石家庄市教学质量检测)Pilates, yoga and the running machine get all the attention when it comes to popular ways to stay healthy.

　　There is, however, a more humble exercise that might not be so attractive, but has all the benefits — walking.

　　Certified fitness professional Jolynn Jaekel explains, “What I love about walking is that anyone can do it at any age and any fitness level. Plus, it is good for your heart, your head and your wallet.”

　　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.

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