This, I think, is the proper recipe for remaining young.
A、This is the best thing to do to keep fit.
B、This is the right way to stay young.
C、This is the healthy food one should eat in old age.
D、This is the secret of maintaining a youthful appearance.
【正确答案】：B
【题目解析】：原句译文：我想，这是保持年轻的诀窍。A项中keep fit意为保持健康，与原文不符；C项中的healthy food（健康食品）原文没有提到；D项意为这是保持年轻面容的秘密，与原文不符。答案为B。
