有资料表明，吸烟者几乎都是从青少年时期开始吸烟。19岁以后吸烟的仅占吸烟人数的10%左右。青少年吸烟已成为不容忽视的社会问题。下列对吸烟的认识正确的是[ ]

①吸烟很酷，可以体现男子汉的风度

②吸烟是成熟的标志

③未成年人吸烟是一种不良行为

④吸烟有害身体健康，我们青少年应自觉抵制这一不良诱惑    

A．①②③    

B．③④    

C．②③④    

D．①②③④

Napping is one of the best, most underused tools for busy people. It is frowned 62 by many people and is viewing as something for the elderly and children. Mention napping and you could be seen as lazy, depressed and 63 to work. The majority of people experience drowsiness in the afternoon and notice their productivity and 64 starting to slip and napping will help 65 this and fight the 66 of fatigue such as stress and a lack of mental 67 .
Research on napping is 68 showing positive effects. The results suggest, for example, 69 napping can make you more 70 , reduce stress and improve 71 functioning compared to working all day without rest. A mid-afternoon sleep means that productivity can last long into the night.
Finding 15-30 minutes in a day can sometimes seem difficult, 72 , doing so could mean a great deal to your productivity. Even 10 minutes a day will be better than nothing at all, and may give you the 73 you need to be successful. If you want to give it a try, make sure you can find a 74 place before setting your head down. If you can feel secure and let go, then the nap will be even more 75 .
A lot of people who wish to start their own businesses but are currently working 9-5 will benefit 76 a nap. The majority of the work on their own business will be done after 5pm and it is hard to stay 77 and inspired at this time. Taking a nap during a 78 at work or just after finishing work could 79 increase your 80 levels, allowing you to 81 your own business after the 9-5 grind.

A．farther

B．fabricate

C．suspend

D．further