A：eats, and
B：eat, or
C：eats, or
D：eat, and
—It doesn't matter．Please remember ________ it here this afternoon．
—Yes, of course.
某旅游区的门票售价是：成人票每张88元，儿童票每张30元．某日售出门票900张，共得61800元．设儿童票售出x张，依题意可列方程（ ）
