A．It damages our immune system.

　　B．It is lacking in protein.

　　C．It has few nutrients.

　　D．It contains too much omega 3.

　　61．In the opinion of Sai, humans are born vegetarian because humans

　　.

　　A．believe that veg foods are good for their teeth

　　B．belong to the plant-eating animal family

　　C．have the similar teeth structure as plant-eating animals

　　D．can adapt to the living conditions like plant-eating animals

　　62．What advice is given by Santos?

　　A．Not to eat non-veg food every day.

　　B．To have a daily veg+ meat diet.

　　C．To eat digestible food every day.

　　D．Not to eat food without protein.

　　C

　　CHICAGO (Reuters) - Smoking not only can wrinkle(起皱纹) the face and turn it yellow -- it can do the same to the whole body, researchers reported on Monday.

　　The study, published in the Archives of Dermatology, shows that smoking affects the skin all over the body -- even skin protected from the sun.

　　"We examined non-facial skin that was protected from the sun, and found that the total number of packs of cigarettes smoked per day and the total years a person has smoked were linked with the amount of skin damage a person experienced," Dr. Yolanda Helfrich of the University of Michigan, who led the study, said in a statement.

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