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It would be neither the first nor the last time that Rice, P......

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单项选择题
The passage suggests that scientists might not have developed the theory of cell-mediated immunological reactions if______.
A．proteins existed in specific group types
B．proteins could have been shown to direct the synthesis of other proteins
C．antigens were always destroyed by proteins
D．antibodies were composed only of protein
单项选择题
The university generously offered the ______ of its grounds and buildings.
A．hospitality
B．excellence
C．discomfort
D．resemblance'
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