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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．Some students just give up on their classes.B．A positive attitude is the key to success in college.C．The survey may be unscientific.D．It is important to educate college students.
A．Some students just give up on their classes.
B．A positive attitude is the key to success in college.
C．The survey may be unscientific.
D．It is important to educate college students.
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