题目

In such hot weather, the new plant will have to be protected from the sun if they ______.    A. are surviving              B. survives                   C. are to survive            D. have survived 答案：C 解析: 略动物是多种多样的，目前已知的有150多万种，人们根据其体内有没有    ，把动物分成两类，一类为    ，另一类为    ．