B为什么不对呢？
这是归纳题题型，从这句话
Unlike other mice, mice that are genetically incapable of making these particular cells do not show elevated levels of nitrates when infected with bacteria，我推出了正常的mice， mice that are genetically capable of making these particular cells do show elevated levels of nitrates when infected with bacteria。再根据Macrophages are cells that play a role in the response of the immune system of mice and other mammals to invasive organisms such as bacteria. 选择了B。
我错在什么地方呢？望指正。谢谢！ | 
