单项选择题

A new task facing biological security is to prevent ______ diseases and misuse of deadly agents.

A．ethnic
B．essential
C．epidemic
D．exterior
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There's the fear that parents might clone a child to have spare parts ______ an organ transplant is needed.
A．so that
B．as if
C．in case
D．in that
单项选择题
Seeing the ghost-like figure, the man fled, ______ the door behind him.
A．slamming
B．slashing
C．slipping
D．slicing
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