Governments don't have to _44_ healthier lifestyles through laws for example, smoking bans. Rather, if given an environment created by a choice architect-one that encourages us to choose what is best-we will do the right things. In other words, there will be designs that gently push customers toward making healthier choices, without removing freedom of choice. This idea combines freedom to choose with _45_ hints from choice architects, who aim to help people live longer, healthier, and happier lives.
The British and Swedish governments have introduced a so-called "traffic light system" to _46_ foods as healthy or unhealthy. This means that customers can see at a glance how much fat, sugar, and salt each product contains _47_ by looking at the lights on the package. A green light _48_ that the amounts of the three nutrients are healthy; yellow indicates that the customer should be _49_; and red means that the food is high in at least one of the three nutrients and should be eaten in _50_. The customer is given important health information, but is still free to decide what to choose.
III. Reading Comprehension
Section A
Directions: For each blank in the following passage there are four words or phrases marked A, B, C and D. Fill in each blank with the word or phrase that best fits the context.
Research has shown that two-thirds of human conversation is taken up not with discussion of the cultural or political problems of the day, not heated debates about films we've just watched or books we've just finished reading, but plain and simple _51_.
Language is our greatest treasure as a species, and what do we _52_ do with it? We gossip. About others' behaviour and private lives, such as who's doing what with whom, who's in and who's out-and why; how to deal with difficult _53_ situations involving children, lovers, and colleagues.
So why are we keen on gossiping? Are we just natural _54_，of both time and words? Or do we talk a lot about nothing in particular simply to avoid facing up to the really important issues of life? It's not the case according to Professor Robin Dunbar. In fact, in his latest book, Grooming, Gossip and the Evolution of Language, the psychologist says gossip is one of these really _55_ issues.
Dunbar _56_ the traditional view that language was developed by the men at the early stage of social development in order to organize their manly hunting activities more effectively, or even to promote the exchange of poetic stories about their origins and the supernatural. Instead he suggests that language evolved among women. We don't spend two-thirds of our time gossiping just because we can talk, argues Dunbar— _57_, he goes on to say, language evolved specifically to allow us to gossip.
Dunbar arrived at his cheery theory by studying the _58_ of the higher primates(灵长类动物)like monkeys. By means of grooming--cleaning the fur by brushing it, monkeys form groups with other individuals on whom they can rely for support in the event of some kind of conflict within the group or _59_ from outside it.
As we human beings evolve from a particular branch of the primate family, Dunbar _60_ that at one time in our history we did much the same. Grouping together made sense because the bigger the group, the greater the _61_ it provided; on the other hand, the bigger the group, the greater the stresses of living close to others. Grooming helped to _62_ the pressure and calm everybody down.
But as the groups got bigger and bigger, the amount of time spent in grooming activities also had to be _63_ to maintain its effectiveness. Clearly, a more _64_ kind of grooming was needed, and thus language evolved as a kind of vocal(有声的)grooming which allowed humans to develop relationship with ever-larger groups by exchanging information over a wider network of individuals than would be possible by one-to-one _65_ contact.
51. A. claim B. description C. gossip D. language
52. A. occasionally B. habitually C. independently D. originally
