单项选择题


A．observation
B．information
C．behaviour
D．appearance
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单项选择题
A．providedB．suppliedC．supplementedD．supported
A．provided
B．supplied
C．supplemented
D．supported
单项选择题
A．enteredB．recommendedC．introducedD．prepared
A．entered
B．recommended
C．introduced
D．prepared
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