大全-29-3，5

mars_cheung

我刚好也错了这两题，试着说一下，抛砖引玉，希望NN来指正。

Quiz3，我选的是 D。错误原因，题干说的是during laboratory dives，D是对这句话的重写：the lactic acid is releasedinto the seal’s blood only after the seal surfaces, when the lungs, liver, and other organs quickly clear the acid from the seal’s bloodstream. 应该理解成海豹上水后乳酸快速减少的原因。

无氧代谢产生乳酸，前面一句话The seal essentially shuts off the flow of blood to other organs, which either stop functioning until the seal surfaces or switch to an anaerobic (oxygen-independent) metabolism.以及anaerobic metabolism occurs only in those tissues which have been isolated from the seal’s blood supply都说明了在潜水过程中，海豹的血液接触不到无氧代谢的器官，所以显然 C 正确。

mars_cheung

Quiz5，我选了 B。没理解清楚题意，把 B 理解成实验室结果跟野外观察结果差异的原因没错，这也是文章在最后一段作者隐含的意思。because in laboratory dives the seal is forcibly submerged, it does not know how long it will remain underwater and so prepares for the worst. 可以理解成实验室跟野外客观条件不一样，所以海豹反应也不同。

不过题目说的是 According to the author，应该理解成在开始时作者对实验结果的预测，定位句：however, suggest that during more typical dives in the wild, this seal’s physiological behavior is different.  However 也说明了后面的观点语气上的转折。

这题有些牵强，希望NN来拍砖啊