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
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
单项选择题
If customers are returning shirts because of crooked collars, the people most likely to identify the cause of the problem are ______.
A．the salesmen
B．the supervisors
C．top management
D．the front line workers
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