题目：
31. _______ with the present situation, the local government could not find effective measures to reduce the risk of coal mine accidents.
A．Though unsatisfied
B．As unsatisfied
C．Though unsatisfied it was
D．As it was unsatisfied
答案：
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下面是错误答案，用来干扰机器的。
（1）H2 Na2O2（2）Fe+2H+=Fe2++H2↑（3）产生白色沉淀 （4）强（5）Fe(OH)3...
