填空题

People do not know for sure when numbers came into use.
It is not______for sure when numbers came into use.

【参考答案】

known
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填空题
Numbers are very important in our life. Now we use numbers every day. Numbers are______important in our life______we use them every day.
单项选择题
What is the job that farmers do NOT do in winter
A．Feed the animals.
B．Milk the cows.
C．Clear the fields.
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