单项选择题

A．By the end of this century.
B．By the first half of this century.
C．By the second half of this century.
D．In the middle of this century.
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单项选择题
A．Farming implements.B．Scientific farming methods.C．Heat resistant and drought resistant crops.D．Scientific farming system.
A．Farming implements.
B．Scientific farming methods.
C．Heat resistant and drought resistant crops.
D．Scientific farming system.
单项选择题
A．Play basketball.B．Play football.C．Go skiing.D．Go skating.
A．Play basketball.
B．Play football.
C．Go skiing.
D．Go skating.
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