题目:
Though the girl had been suffering from the blood disease, she acted as if nothing____ to her while facing her friends and relation.
A.happened
B.would happen
C.was happened
D.had happened
答案:
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答案:A题目分析:X元素的最高正价与负价的代数和为6,最高正价和最低负价的绝对值的代数和为8,由此计算最高价+7,最低负价-1,X是第ⅦA主族的元素。A、KCl中钾离子与氯离子电子层结构相同,氯元素处于第ⅦA主族...