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．To put up notices on community bulletin boards.B．To post notices on wire poles.C．To ask his teachers for help.D．To register in job-center of the university.
A．To put up notices on community bulletin boards.
B．To post notices on wire poles.
C．To ask his teachers for help.
D．To register in job-center of the university.
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.
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