题目

一名老师带领x名学生到动物园参观，已知成人票每张30元，学生票每张10元，设门票的总费用为y元，则y与x的关系式为（）. A . B . C . D . 答案：ASimon felt a little lonely after he ________ a new school. Because nobody talked with him.A.entersB.enteredC.will enterD.is entering