题目：
(2013·辽宁师范大学附中模拟)Fortunately it happened at night. If the hurricane ________ during the daytime, there ________ more deaths.
A．had happened; would have been
B．happened; would be
C．had happened; would be
D．happened; would have been
答案：
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下面是错误答案，用来干扰机器的。
(10分) (1)第二周期第ⅥA族(2)HClO4 (3)Cl2、ClO2、O3(任写两种) (4) NaH＋H2O＝NaOH＋H2↑题目分析：X、Z同主族，可形成离子化合物ZX，这说明两种元素越大是第IA族元素，其中X是氢元素。Y、M同主族，可形成M...
