下面加线字的注音全都正确的一项是（ ）

根据短文内容，选择正确答案。
A
    One day, Mr. and Mrs. White went shopping by car. They stopped their car near a store. They bought a lot of things and they wanted to put them in their car. But Mr. White couldn't open the door of the car. “Let's ask a policeman for help.” said Mrs. White. They asked a policeman to help them. The policeman was very friendly to help them open the door of the car. Just then a man came up and shouted, “What are you doing with my car?” Mr. and Mrs. White took a look at the number of the car. It was not their car.

They walked into the classroom one _____ one.

三角形最多有____个锐角，最多有____个直角，最多有____个钝角。

读《钢铁是怎样炼成的》，1920年8月，他在战争中负伤，导致____。