题目

Before he sailed round the world alone, Francis Chichester had already surprised his friends several times. He had tried to fly round the world but failed. That was in 1931. The years passed. He gave up flying and began sailing. He enjoyed it greatly. Chichester was already 58 years old when he won the first solo transatlantic sailing race. His old dream of going round the world came back, but this time he would sail.His friends and doctors did not think he could do it, as he had lung cancer. But Chichester was determined to carry out his plan. In August 1966, at the age of nearly 65, a下图是模拟膈肌的运动与呼吸的关系示意图。下列叙述正确的是(     )A．甲图演示吸气，膈肌收缩　　B．乙图演示吸气，膈肌舒张C．甲图演示呼气，膈肌舒张　　D．乙图演示呼气，膈肌收缩