题目1单选题
极限<img src="http://p.ananas.chaoxing.com/star3/origin/07b6699cf5d28f242ada7dcb05e97486.png">_____A. <img src="http://p.ananas.chaoxing.com/star3/origin/e9f860565702fade63f4e8f4ab746ee5.png">B. <img src="http://p.ananas.chaoxing.com/star3/origin/2592c71dd308e238687af007cbf48e16.png">C. <img src="http://p.ananas.chaoxing.com/star3/origin/e78be7eb3f1cc8af195162a5c45c4e5b.png">D. <img src="http://p.ananas.chaoxing.com/star3/origin/cfe49d6f3ee9b81f57a8ab28b65b0cf5.png">