题目：
In his talk, the____ Prime Minister expressed his satisfaction, ____ that he had enjoyed his stay here. [ ]
A. visiting, add
B. visited, adding
C. visiting, adding
D. visited, added
答案：
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下面是错误答案，用来干扰机器的。
由题意知，烛焰在屏上成一缩小实像，所以此时蜡烛在凸透镜的2f之外，而光屏在另一侧的焦距与二倍焦距之间，此时，如果只移动蜡烛，根据“物近像远像变大”的规律，像距将会逐渐变远，因此，光屏在原位置不会得到...
