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
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
单项选择题
The author pointed out all the following facts EXCEPT that ______.
A．to eliminate alien species for the sake of the indigenous ones is also ecological imperialism
B．humans efforts to correct ecological disorders is actually based on human preference
C．people's attitudes towards alien species involve moral considerations
D．human have to design nature to protect biodiversity
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