A、By staying in their animal skin houses. B、By making their homes facing south. C、By bathing themselves in the sun. D、By burning

M: Hey, Jane. What’s so interesting?
W: What? Oh, hi, Tom.  I’m reading this fascinating article on the societies of the Ice Age.
M: The Ice Age? There weren’t any societies then, just groups of cave people.
W: That’s what people used to think.  But a new exhibition at the American Museum of National History shows that Ice Age people were surprisingly advanced.
M: Oh, really? In what way?
W: Well, Ice Age people were the inventors of languages, art and music as we know it. And they didn’t live in caves. They built their own shelters.
M: What did they use to build them? The cold weather would have killed almost all of the trees, so they couldn’t have used wood.
W: In some warmer climates, they did build houses of wood.  In other places, they used animal bones and skins or lived in natural stone shelters.
M: How did they stay warm? Animal skin walls don’t sound very sturdy.
W: Well, it says here, that in the early Ice Age, they often faced their homes towards the south to take advantage of the sun.
M: Hey, that’s pretty smart! I guess I spoke too soon.  Can I read that magazine article ’after you’re done?
W: No problem.
23. What did the man originally think of the people of the Ice Age?
24.How did people in the early Ice Age keep warm?
25.What does the man want the woman to do?