C．d­c­b­a

　　D．d­b­c­a

　　18．All the following are the problems of the scheme EXCEPT________.

　　A．the high cost to hire a bike

　　B．not registering their usage of the bikes

　　C．not charging for the first day of the scheme

　　D．docking the bikes properly

　　19．From the passage we can infer that ________.

　　A．London Mayor is confident of the scheme

　　B．the scheme will be cancelled because of the problems

　　C．all the citizens in London support the scheme

　　D．the cycling revolution is not successful

　　B

　　When we offer our best wishes to others, more often than not, we say: “May you be happy every day”. But it's easier said than done to stay happy all the time. There are always things that stand in its way.

　　The first, perhaps the biggest is genetics. Some scientists say that some people are naturally happier than others. Besides, major life events as well as social and economic factors can also stand in the way of happiness, such as losing your job or a family member. Then, there is health affecting your happiness. So, is it possible that people can find lasting happiness with so many factors preventing them?

　　Positive psychologists(心理学家)believe it's possible for people to stay happy for long periods, although it cannot be lasting. Martin Seligman at University of Pennsylvania argues that day­to­day happiness comes from two things: pleasures and satisfactions. Pleasures are rich experiences that simply make us feel good things like eating cake or drinking wine. While pleasures can be quite satisfying, the enjoyment we get from them is short­lived.

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