单选题 Passage Four On a hot summer's day many years ago, I was on my way to pick up two items at the supermarket. I was then a frequent visitor to it because there never seemed to be enough money for a whole week's food-shopping at once. My wife, after a tragic battle with cancer, had died just a few months earlier. There was no insurance -just many expenses and a mountain of bills. I held a part-time job, which barely generated enough money to feed my two young children. Things were really bad. And so, with a heavy heart and four dollars in my pocket, I was on my way to the supermarket to purchase a gallon of milk and a loaf of bread. The children were hungry and I had to get them something to eat. As I came to a red traffic light, I noticed on my right a young couple and a child on the grass next to the road. The noonday sun beat down on them without mercy. The man held up a sign which read, “Will Work for Food.” The woman stood next to him, staring at the cars stopped at the red light. The child sat on the grass holding a one-armed doll. I noticed all this before the light changed to green. I wanted so desperately to give them a few dollars, but if I did that, there wouldn’t be enough left to buy the food for my kids. Four dollars will only go so far. As the light changed, I took one last glance at them and sped off feeling both guilty and sad. As I kept driving, I couldn't get the picture of them out of my mind. The sad, haunting eyes of the young couple stayed with me for about a mile. I could take it no longer. I felt their pain and had to do something about it. I turned around and drove back to where I had last seen them. I pulled up close to them and handed the man two of my four dollars. There were tears in his eyes as he thanked me. I smiled and drove on to the supermarket. Perhaps both milk and bread would be on sale, I thought. And what if I only got milk alone, or just the bread? Well, it would have to do. Questions 16-20 are based on Passage Four.