题目

完形填空,阅读下面短文，理解其大意，然后从各题所给的四个选项中，选出可以填入空白处的最佳选择。     Once there were several scientists in a forest.They were trying to _1 the rarest animal in the world.No one had seen it ,so everyone was _ 2  and wanted to be the first one to photograph and study it.The animal only came out at night, _3   the scientists did some other studies in the day. _4   them,there was a famous scientist named Walter. Every day,he would spend an hour sitting at the desk and putting all his equipment（设备）in t现有氨基酸800个，其中氨基总数为810个，羧基总数为808个，则由这些氨基酸合成的含有2条肽链的蛋白质共有肽键、氨基和羧基的数目依次分别为（ ）A. 798、2和2 B. 798、12和10C. 789、1和1 D. 799、11和9