[单项选择]Fire can do people good and also do bad. Fire can keep you (41) , but fire can burn things, (42) Big fire can bum trees, houses, animals or people. There are (43) interesting old stories about how man started a fire. One of the stories is about (44) man. The man (45) long time ago. He went up the sun and (46) fire down. Today people can make a fire (47) matches. But matches can be dangerous (危险). One match can burn a piece of paper, and it can (48) burn a house. So you (49) be careful with matches. Be careful with fire, and it will (50) you. If not, it may hurt you.
A. cool B. warmer C. warm

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