单项选择题

A．refers
B．applies
C．happens
D．concerns
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单项选择题
A．demonstratedB．implementedC．releasedD．revealed
A．demonstrated
B．implemented
C．released
D．revealed
单项选择题
A．relativelyB．intelligentlyC．regularlyD．environmentally
A．relatively
B．intelligently
C．regularly
D．environmentally
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