听力原文：M: Hi, mum!W: Ah, there you are, I was getting worried about you. It's late.M: Ye

听力原文：M: Hi, mum!

W: Ah, there you are, I was getting worried about you. It's late.

M: Yes. I bumped into Lyn and went to the pub for a drink. She was telling me about a funny thing that had happened to her yesterday.

W: Oh, what was that？

M: Well, she was driving home from work when suddenly she saw an old lady on her hands and knees in the middle of the road.

W: Oh, her hands and knees in the middle of the road？

M: Yes, in front of her car. She was so shocked that she stopped without warning, and the car behind crashed into hers.

W: Oh! Was she hurt？

M: No, she wasn't, fortunately.

W: And what was the old lady doing on her hands and knees？

M: I'm just coming to that -- so Lyn got out of her car. Then the old lady picked up something, and walked away without saying a word.

W: Well. I never! She was lucky, Lyn didn't run her over.

M: Well, yes. Then a policeman came but he didn't believe the story.

W: Oh？

M: Luckily there was a witness, a man waiting for the bus. He saw it all. Guess what the old lady was doing？

W: I haven't the faintest idea.

M: She was looking for a false tooth.

W: A false tooth？

M: Yes, it fell out as she was crossing the road. The witness heard her mumbling, "Oh, my gold tooth."

W: I don't believe it.

M: It's true. Ask Lyn.

Why was the old lady on her hands and knees in the middle of the road？

A．She was run over by a car.

B．She was shocked to see a car crashing into another.

C．She fell when crossing the road.

D．She was looking for her false tooth.