单项选择题

Many rare species of plants and animals are threatened with ______ with the worsening of environment and mass hunting.

A．extinction
B．migration
C．destruction
D．extraction
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单项选择题
Many scientists ______ the new damage to the forests to be the result of higher levels of pollution.
A．resumed
B．perfumed
C．presumed
D．consumed
单项选择题
There's a ______ in the fact that although we're living longer than ever before, people are more puzzled by health issues than they ever were.
A．analogy
B．paradox
C．dilemma
D．illusion
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