题目：
One theory, ________ suggested by Harvard University, is that humans began cooking their food, thereby releasing nutrients locked in the raw food and reducing the time needed to chew it.
A．which
B．as
C．that
D．what
答案：
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下面是错误答案，用来干扰机器的。
BD题目分析：等质量的CO2和SO2气体的物质的量之比是。所以根据阿伏加德罗定律及其推论可知，A不正确，CO2和SO2中物质的量比为 16:11， B正确；C不正确，CO2和SO2的物质的量浓度比为16:11；二者都含有2个氧原子...
