单项选择题

What does the world "xenophobia" mean

A．The ecological disorders.
B．The passion to save the endangered ecosystem.
C．The ecological imperialism,
D．The fear for alien species.
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单项选择题
Botanists have generated attempts to remove the Japanese knotweed because ______.
A．it threatens the local biodiversity
B．it is regarded as exotic
C．it is so vigorous as to spread everywhere
D．it checks other plants growth
单项选择题
As for what to do about alien species, the author thinks ______.
A．who should make such decisions is open to doubt
B．the decisions should be based on scientists' conclusions
C．decision making should involve more people other than scientists
D．it is morally unacceptable to eradicate all alien species
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