A、It was raining. B、It was clear. C、It was snowing. D、It was cloudy. C细节题。从文中可知那天下了大雪，所以医生在出诊时看不清路，开车开了很久才到。

I had just gone to bed after a very hard day when the phone rang. It was an eccentric farmer. I had never met him before although I had often heard people talk about him. He seemed quite hysterical and he had been talking for a minute or so before I understood anything. Even then all I could make out was that someone called Milly had had a very bad accident. I hadn’t the slightest idea who she was but I obviously had to go.
    It had been snowing heavily that day and I didn’t know the way. I had been driving for at least an hour when I finally found his place. He was standing there, waiting for me. It seemed Milly had already died. "She meant more to me than anyone...even my own wife!" he said. I could see that he had been crying. I assumed a terrible tragedy had taken place with the overture of a possible scandal. I must admit I was even more shocked when he told me he had put her in the barn. "I wouldn’t leave her out in the cold!" he said.
    Milly had clearly been a sweetheart of his. I was about to tell him he could not expect me to cover anything up when he opened the barn door and pointed his torch at a motionless shape on the straw. "She was such a good cow! I wouldn’t let anyone but a doctor touches her!" he said, and burst into tears again.
Questions 23 to 25 are based on the passage you have just heard.
23. Why did the speaker say that she obviously had to go?
24. What was the weather like that day?
25. Who did the speaker think Milly was when she saw the farmer?