题目1单选题
设函数<img src="https://tihai-oss-cloud.itihey.com/img/eb7978cf97a822cc61917206726511f3.png">,求其定义域A. <img src="https://tihai-oss-cloud.itihey.com/img/e29d2a74d2bd348db9460f84fb5a971c.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/ee67e940d16363ca33ff4ae4f5e4aa84.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/a7ac1c3edac8cb656172b66bf38f3a6d.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/48f5223734666e6ef40e588b4d431031.png">E. <img src="https://tihai-oss-cloud.itihey.com/img/091d15629bfea9f583aff598e50ea4ac.png">