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
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