单项选择题
A. Reducingcancers． B. Preventing strokes． C. Improvingmemory． D. Protecting the heart．
A. Itis expensive． B. It is fashionable． C. It isa good bargain． D. It is the best choice．
A. Hefeels a great pity for it． B. He feels disappointed with it. C. It isstill working effectively． D. It is falling into great trouble．