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．On the whole, she liked the performance.B．She didn’t watch the performance.C．The performance was very exciting.D．The performance wasn’t as good as she’d expected.
A．On the whole, she liked the performance.
B．She didn’t watch the performance.
C．The performance was very exciting.
D．The performance wasn’t as good as she’d expected.
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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