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题库 / OG2017V-SC-263
In the textbook publishing business, the second quarter is historically weak, because revenues are low and marketing expenses are high as companies prepare for the coming school year.
low and marketing expenses are high as companies prepare
low and their marketing expenses are high as they prepare
low with higher marketing expenses in preparation
low, while marketing expenses are higher to prepare
low, while their marketing expenses are higher in preparation
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higher的出现没有必要（并没有指出比较对象），low不可以与higher相对应
AB 选A B their无所指代
B选项：their指代revenues有问题，后面的they指代模糊；
C选项：higher对比的对象不明确，同时也不和low平行；文意改错了，low revenues have higher marketing expenses,这个在文中没有直接关系
D选项：higher 比较对象不详；to prepare很尴尬
E选项：their指代对象不详；higher比较对象不详；文意被改变；
b, they找不到指代对象