题目:
The number of endangered plants and animals________increasing,because a large number of their
natural habitats________being destroyed. [ ]
A. are; are
B. are; is
C. is; are
D. is; is
答案:
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答案:C题目分析:最高正价等于其主族序数,最高正极和负价代数和为8,可以推知L、M、T分别为第ⅠA、ⅡA、ⅢA族,Q、R为ⅥA族,又因为同周期从做到右半径依次减小,可以确定R为第二周期,其余为第三周期从而确定...