Why we need to protect polar bears 2

2.The study done by Liu and his colleagues compared different groups of polar bears.

刘和他的同事进行的这项研究比较了不同种类的北极熊。

shed /ʃed/   vt. 去除，摆脱

mystery  [ˈmɪstri]   谜

genetic  [dʒəˈnetɪk]  基因的

B  A 2014 study by Shi Ping Liu and colleagues sheds light on this mystery.They compared the genetic structure of polar bears with that of their closestrelatives from a warmer climate, the brown bears.

3.Liu and colleagues were the first researchers to compare polar bears and brownbears genetically.

刘和他的同事是第一批对北极熊和棕熊进行基因比较的研究人员。

扫一遍原文，没有找到first      NOT GIVEN

4.Polar bears are able to control their levels of'bad'cholesterol by genetic means.

北极熊能够通过基因手段控制它们的“坏”胆固醇水平。

Liu and his colleagues found the polarbears had a gene known as APoB, which reduces levelsof low-density lipoproteins (LDLs) -a form of 'bad'cholesterol.

TRUE