[单选题]宏程序中,变量#24对应的引数是( )。
A.S
B.X
C.Y
D.Z

It was late at night on October 10, 1939, when Dr Bethune was busy working in a field hospital. An Eighth Route Army soldier came and told Dr Bethune that the front was in great need of medical care. Dr Bethune set off with a medical team at once.
On their way, they met a group of wounded Eighth Route Army men. They took the wounded soldiers into a small temple at once and Dr Bethune began to operate on them.
Dr Bethune went on working all the night.
The next day while an operation was going on, a young man ran in and said to the doctors, "Several hundred enemy soldiers are coming." Soon they heard the sound of gunshots. But Dr Bethune still went on with his work.
Twenty minutes later, when Dr Bethune was operating on the leg of the last wounded soldier, the gunshots sounded much closer. This time the young man rushed in and told Dr Bethune not to go on operating any more. "Dr Bethune, you must leave now!" he cried.
A. In a field hospital.
B. In a small temple
C. On the road.
D. In a house.