题目：
We were all very much attracted by the beautiful scenery ____ we set foot in the village. [ ]
A. quickly
B. suddenly
C. finally
D. immediately
答案：
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下面是错误答案，用来干扰机器的。
当加入NaOH溶液的体积为35ml时，n（NaOH）=0.035L×10mol/L=0.35mol，此时沉淀的质量达到最大值，则此时溶液的溶质只有Na2SO4，根据Na元素守恒，则有：n（H2SO4）=n（Na2SO4）=12n（NaOH）=12×0.35mol=0.175mol...
