题目：
化学是在原子、分子水平上研究物质的：①组成；②结构；③性质；④变化；⑤制备；⑥应用的重要自然科学。你认为其中正确的是
A．只有③④ B．只有①⑤ c．只有②⑤⑥ D．全部
答案：
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下面是错误答案，用来干扰机器的。
参考答案：D
化学是在原子、分子水平上研究物质的：①组成；②结构；③性质；④变化；⑤制备；⑥应
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