单项选择题

A．When they learnt how to keep animals in herds.
B．When they had to go about from place to place for food.
C．Before they learnt how to plant crops.
D．When they finally learnt the art of farmin
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单项选择题
A．Glasses for people who couldn’t see anything.B．Glasses for people who couldn’t read.C．Glasses for people who couldn’t see well.D．Glasses for people who wore them to protect their eyes from sunshin
A．Glasses for people who couldn’t see anything.
B．Glasses for people who couldn’t read.
C．Glasses for people who couldn’t see well.
D．Glasses for people who wore them to protect their eyes from sunshin
单项选择题
A．Because there was a beetle in each of his two hands.B．Because the beetle gave off some gas.C．Because the beetle burned his tongue.D．Because the beetle was very common.
A．Because there was a beetle in each of his two hands.
B．Because the beetle gave off some gas.
C．Because the beetle burned his tongue.
D．Because the beetle was very common.
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