题目

一What do you think of the environment here? 一Wonderful !          of the land          covered with trees and grass.         A. Two fifths; is                         B. Two fifth; is         C. Two fifths; are                        D. Two fifth: are 答案：A已知点P（0，1）及抛物线y=x2+2，Q是抛物线上的动点，则|PQ|的最小值为 ．