2．D　词义猜测题。从画线后的because the animals can see ultraviolet light可知D项正确。

　　3．B　推理判断题。从最后两段内容可知B项正确。

　　4．B　主旨大意题。从第二段Now police trying to maintain law in the region are...and want to use reindeer to combat crime...可知B项正确。

　　Ⅱ.完形填空

　　Joe Simpson and Simon Yates were the first people to climb the West Face of the Siula Grande in the Andes mountains. They reached the top __1__， but on their way back conditions were very __2__. Joe fell and broke his leg. They both knew that if Simon __3__ alone, he would probably get back __4__. But Simon decided to risk his __5__ and try to lower Joe down the mountain on a rope(绳)．

　　As they __6__ down, the weather got worse. Then another __7__ occurred. They couldn't see or hear each other and, __8__， Simon lowered his friend over the edge of a precipice(峭壁). It was __9__for Joe to climb back or for Simon to pull him up. Joe's __10__ was pulling Simon slowly towards the precipice. __11__， after more than an hour in the dark and the icy cold, Simon had to __12__. In tears, he cut the rope. Joe __13__ into a huge crevasse(裂缝)in the ice below. He had no food or water and he was in terrible pain. He couldn't walk, but he __14__ to get out of the crevasse and started to __15__ towards their camp, nearly ten kilometers __16__.

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