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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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
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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