题目

Mrs. Thompson loved every one of her pupils but a little boy named Teddy Stoddard. She noticed that the boy didn’t play well with the other children. Once Mrs. Thompson read Teddy’s past records. His first grade teacher wrote. “Teddy is a bright child.” His second grade teacher wrote, “Teddy is troubled because his mother is still excellent.” His third grade teacher wrote, “His mother’s death has been hard on him. We are worrying about him.” Teddy’s fourth grade teacher wrote, “Teddy doesn’t have many friends and sometimes sleeps in class.” By now, Mrs. Thompson reali一空心铁球和一个木球质量相等，均漂浮在水面上，则它们浸在水中的体积：A. 木球大;　　　　　 B. 铁球大;　　　　　 C. 一样大;　　　　　D. 无法判断.