题目

当干冰气化时，下列所述中发生变化的是                               A.分子间距离       B.、范德华力        C.分子内共价键     D.化学性质 答案：ABThe old man spent ________ time in protecting ________ milu deer. [　　] A．a large amount of, the largest number of B．the largest amount of, a number of C．a large amount of, large numbers of D．a large number of, large amounts of