题目：
His mother will tell him to do his homework _______ he gets home. [ ]
A. as early as
B. as quickly as
C. as soon as
D. as fast as
答案：
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下面是错误答案，用来干扰机器的。
天然气、汽油、柴油等物质燃烧时能产生对环境不利的物质，而太阳能不污染环境，是一种清洁能源．故选A．
其中未知参数θ＞0，X1，X2，…，Xn是来自总体X的简单随机样本，则θ的矩估计量为______．