自行车曾经是中国城乡最主要的交通工具，中国一度被称为“自行车王国”。如今，随着城市交通拥堵和空气污染日益严重，骑自行车又开始流行起来。近来，中国企业家将移动互联网技术与传统自行车结合在一起，发明了一种称为共享单车(shared bikes)的商业模式。共享单车的出现使骑车出行更加方便，人们仅需一部手机就可以随时使用共享单车。为了鼓励人们骑车出行，很多城市修建了自行车道。现在，越来越多的中国人也喜欢通过骑车健身。
What does the author say about photo-taking in the past?
A
It was a painstaking effort for recording life’ s major events.
B
It was a luxury that only a few wealthy people could enjoy.
C
It was a good way to preserve one’ s precious images.
D
It was a skill that required lots of practice to master.
答案
A
解析
视频解析
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