43. By studying the cave art, scientists know something about _________.

　　 A. how ancient people crossed the North Sea

　　 B. why some of the animals have died out

　　 C. how humans spread out across the world

　　 D. what kind of animals people hunt at that time

　　 对话填空

　　 (A and B are workmates)

　　 A: Hi! It's (44) f ________ cold today and the wind is howling! My hands numb.

　　 B: It always (45) g_______ cold after a snowfall.

　　 A: I (46) m_______ the weather forecast this morning. Did you hear it?

　　 B: Yes. It (47) s_____ it would be partly coldly today, with a strong wind from the northwest. The highest (48) t_________ during the day would be five below zero.

　　 A: What about tonight?

　　 B: Still colder. The temperature will (49) d____ to eighteen below.

　　 A: Looks as if we're in a spell of cold weather when we start the digging work.

　　 B: So what? Think of the oil workers in Daqing. They battle with wind and snow and (50) b____ cold weather for months every year.

　　 A: Quite right. And they (51) s________ in opening up a great oil-field. They're really an example (52) t______ us.

　　 B: That's the spirit! A cold spell like this is nothing (53) c________ to the cold up there.

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