energy expenditure among the Hadza, a population of traditional hunter-gatherers living in the open Savannah of northern Tanzania. Despite spending their days hiking long distances to seek for wild plants and game, the Hadza burned no more calories each day than adults in the U.S. and Europe. The team ran several analyses accounting for the effects of body weight, body fat percentage, age, and gender. In all analyses, daily energy expenditure among the Hadza hunter-gatherers was indistinguishable(难以区分的) from that of Westerners. The study was the first to measure energy expenditure in hunter-gatherers directly; previous studies had relied entirely on estimates.

　　　These findings overturn the long-held assumption that our hunter-gatherer ancestors expended more energy than modern populations, and challenge the view that obesity in Western populations results from decreased energy expenditure. Instead, the similarity in daily energy expenditure across a broad range of lifestyles suggests that habitual metabolic(新陈代谢的) rates are relatively constant among human populations. This in turn supports the view that the current rise in obesity is due to increased food consumption, not decreased energy expenditure. It means we have more to learn about human physiology(生理学) and health, particularly in non-Western settings.

　　　"These results highlight the complexity of energy expenditure. It's not simply a function of physical activity," says Pontzer." Our metabolic rates may be more a reflection of our shared evolutionary past than our diverse modern lifestyles."

　　　12．According to the new research, hunter-gatherers consume _________.

　　　A．the same energy as Westerners B．more energy than Westerners

　　　C．less energy than Westerners D．the same food as Westerners

　　　13．How did the research team do the new research?

　　　A．By comparing hiking distances. B．By identifying wild plants and game.

　　　C．By estimating daily energy expenditure. D．By measuring daily energy expenditure.

　　　14．People have long assumed that _________.

　　　A．the rise in obesity is due to increased food consumption

　　　B．decreased energy expenditure makes Westerners fat

　　　C．daily energy expenditure stays the same in history

　　　D．humans' habitual metabolic rates are unchanged

　　　15．Which of the following can reflect our shared evolutionary past?

　　　A．Our physiology activity. B．Our energy expenditure.

　　　C．Our metabolic rates. D．Our modern lifestyle.

二、七选五

　　　Why people collect art

　　　Many people through history have gone to great lengths to collect art. But what motivates these collectors?

　　　One popular explanation for collecting is that they can have financial gain. Some resell works, earning enormous profit. 16．. Immorally, some 'collectors' buy art as a form of money laundering(洗钱), since it is far easier to move art than cash between counties without examination.

　　　17．. For them, art is important for other reasons. The best way to understand the underlying drive of art collecting is as a means to create and strengthen social bonds, and as a way for collectors to communicate within these new networks.

　　　Collectors are not only interested in creating social links; they are also motivated by the messages they can send once these social networks are created. We all know art is a powerful way for the artist to express thoughts and feelings. 18．. Displaying art can send a message about who the collector really is --- at least who she sees herself as.

　　　19．. Through the collections, collectors convey messages not just about themselves, but about the world as a whole. For example, the kid with the shoebox of bird feathers might show others her collection not just to make friends, but also to convince them about the importance of protecting endangered species.

　　　People collect art for various reasons. 20．.

　　　A．Some gain art works in an illegal way

　　　B．But most collectors think little of profit

　　　C．Artworks preserve the qualities of their makers

　　　D．No doubt art collection is a hard addiction to overcome

　　　E. Some get large tax reductions for donating art to museums

　　　F. It also serves as an effective way to express collectors

　　　G. Other art collectors see their collections as having a broader power

三、完形填空

　　　My car needed some mechanical work that I could not do myself. Since the garage I had been taking my car to had __21__, my friend Dave gave me a recommendation: D's Auto Repair.

　　　I was pleasantly __22__ to discover that the owner of D's was a mechanic who had worked on my car several years earlier. __23__ he was an employee at a gas station near my house. I knew that his work was good.

I ___24_ the paperwork for the repair and _25__ while D took a phone call from another customer. As I sat there, I looked around the small office to keep myself __26___ A framed newspaper article caught my