According to Dr．Kawecki，greater brain activity_________

单选题 According to Dr．Kawecki，greater brain activity__________．

A．reduces oxygen consumption
B．regulates the nervous system
C．speeds up the ageing process
D．stabilizes the ageing process

参考答案C

解析: 推断题。从文章第五段最后一句“However，Dr．Kawecki thinks the effect could also be a by-product of greater brain activity increasing the production of Reactive Oxygen Species(ROS)，which Can increase oxidation in the body and damage health．”可知，奎克教授认为这种影响也可能是大脑活动产生活性氧的副作用，活性氧会增强身体的氧化并损害健康。由此可推断，大量的脑力活动会加速衰老，故选C。

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单选题 We learn from the text that__________．

A．the research findings need to be tested further
B．biologists are doing similar research on other animals
C．the animal world usually follows the same universal laws
D．biologists are applying their findings to other areas

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单选题根据下面资料，回答题。
Richard :
I´ ve always viewed tipping as a way of saying "thank you" to the one who serves me. I be-lieve what is bad is when no tip is left at all. The better the service, the higher the tip. Unless the service is literally perfect, I never tip more than 10% of the bill. Much like the harder teachers in school, I never give an easy "A. " My assessment is honest.
Daniel :
A tip is a "thank you," but in truth, a tip is payment for service.20% is a standard tip. Serv-ers deserve it for their hard work. Restaurants will never pay more for labor unless they are forced to do so by new laws. Tips make up about 97% of a server´ s total income. Those tips arc needed for survival. So, before servers are paid a living wage, tip 20%.
Kate:
Why should I pay the difference between what the restaurant is willing to pay the employee and what an acceptable wage is? I do pay 20%, but ! hate it. A friend of mine left Europe for New York City, found a job in a restaurant there and ended up making $ 5,500 a month. Enough above mini-mum wage? How about miners, construction workers, resident doctors, etc? Do they get tipped?
Patricia:
18 -20% for good service is today´ s standard. The restaurant and its employees are too polite to tell you this or to put it on their menus, but that is their expectation and you need to understand that. I believe it is good manners to respect this. To do otherwise is to be openly rude. If you dis-agree, you are wise to eat elsewhere, as you are hurting a hardworking professional.
Michael :
Tipping has gotten out of control. I always bad thought it was 15%, and now suddenly servers have made it 20%. I tip 15%, and that´ s it. If the service is really superior, then I work higher from there. Interesting to be told, "If you can´ t afford to tip 20%, then you should eat at home. "
If all those people stayed away, the restaurant would not even be in business.
Now match the name of each person (36 -40) to the appropriate statement.
Note: there are two extra statements.
Statements
36．Richard
37．Daniel
38．Kate
39．Patricia
40．Michael
A． It’s rude not to tip．
B．I do tip，though I don’t like it．
C．Tipping shouldn’t be compulsory．
D．Tips are essential to servers’survival．
E．If you don’t tip，you are punishing the server．
F．I think the current tipping standard is too high．
G．My tip faithfully reflects how good the service is．
第(36)题选

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单选题 第(37)题选

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