The new president and his government will have to face ___________ problems such as unemployment and_刷题宝

题干

The new president and his government will have to face ___________ problems such as unemployment and poor health.

A：social

B：environmental

C：cultural

D：universal

上一题下一题 0.0难度选择题更新时间:2019-01-27 11:38:10

答案(点此获取答案解析）

A

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下列关于胚的组成，正确的是（　　）

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日常所用干电池的电极分别为石墨棒（上面有铜帽）和锌皮，以糊状NH₄Cl和ZnCl₂作电解质（其中加入MnO₂吸收H₂），电极反应式可简化为：Zn﹣2e^﹣=Zn²⁺，2NH₄⁺+2e^﹣=2NH₃↑+H₂↑（NH₃与Zn²⁺能生成一种稳定的物质）．根据上述判断，下列结论正确的是（）

①锌为正极，石墨为负极②锌为负极，石墨为正极③工作时，电子由石墨极经过外电路流向锌极④长时间连续使用时，内装糊状物可能流出腐蚀用电器．

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There are many ____ (horse/potatoes) on the farm.

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