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【答案】1.Yes, they can.2.People use fire to cook food and boil water.3.Yes, they do.4. Yes, it is.5. No, they can't.
【解析】
这是一篇讲述人类用火的短文。
(1)根据短文叙述 Many years ago, people use a stick, a large piece of wood and dry leaves to make a fire.(许多年前,人们用短棍,大块的木头和干树叶来生火。)可知本句用肯定回答。故答案为:Yes, they can.
(2)根据短文叙述At home, people use fire to cook food and boil water.(在家里,人们用火去做饭和烧水。)可知是做饭和烧水。故答案为:People use fire to cook food and boil water.
(3)根据短文叙述Some workers use fire to make glass.(一些工人用火来制作玻璃杯。)可知用肯定回答。故答案为:Yes, they do.
(4)根据短文叙述but sometimes fire is dangerous. (可是有时候火很危险。)可知用肯定回答。故答案为:Yes, it is.
(5)根据短文叙述we mustn't cook without an adult (成年人). (我们禁止在没有成年人的情况下做饭。)可知用否定回答。故答案为:No, they can't.