单选题
How did people begin to use a fire?
A、
We know how people began to use fire.
B、
Nobody knows how to make a fire.
C、
It was an Australian who started a fire.
D、
We are not sure how people started a fir
【正确答案】
D
【答案解析】
第2段第1句Nobody knows for sure how people began to use fire说明了没有人能确切地知道人类是怎样开始使用火的，答案为D。
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