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
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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.
单项选择题
In the author's opinion, the attempt to eradicate the Japanese knotweed ______.
A．is worthy of praises
B．reflects people's desire to protect ecological biodiversity
C．shows people's passion to save endangered species and vulnerable ecosystems
D．is biased by human preferences
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