单项选择题

Many people believe that our species ______ threatened with extinction.
IA] is [BI are [C] are to be [D]used to be
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单项选择题
I am determined to get a ticket for the football games ______ it means standing in a queue all night.
A．provided
B．as if
C．even if
D．whatever
单项选择题
A．childrenB．humansC．organismsD．organizations
A．children
B．humans
C．organisms
D．organizations
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