题目2A. <img src="https://tihai-oss-cloud.itihey.com/img/a671e60aa5c1418d0eb59008e53c5dbf.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/d60b39c444a18f9e997d8ed3a79d47fb.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/9de4b9733912ab2c7733660b1f34edf4.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/251e58b86fc720848aea4740d93253d4.png">