⑴What's your favourite season?____                           A. It's sunny and cool.

⑵Why do you like winter?____                                    B. I can swim.

⑶I like spring.____                                                       C. Autumn.

⑷What can you do in summer?____                           D. Because I can skate.

⑸What's the weather like in autumn in Beijing?____  E. Me too.

目前，中国吸烟人数已高达3.16亿，青少年吸烟率为6.3%，约有1 400万青少年烟民。同时，青少年吸烟呈现出低龄化趋势。吸烟对于青少年而言是一种（    ）