单项选择题

The study was made by ______

A．Edinburgh University
B．the World Health Organization
C．Oxford University
D．Edinburgh University and the World Health Organization
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单项选择题
75（）

A．through
B．into
C．by
D．in
单项选择题
74（）

A．so as to be seen
B．so as not to be recognized
C．so as to be not caught
D．so as not to be seen
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