201.Experts say walking is one of the best ways for aperson to__healthv. A.prserve B.stay C.maintain D.reserve答案 B。A 项 preserve 是及物动词,表示"保护"。B 项 stay是不及物动词,后面跟形容词时,成了联系动词。stayhealthy 的意思是"保持健康",相当于 remain healthy。C 项maintain 是及物动词,是"保持,继续"的意思。D 项 reserve