单项选择题

How does the author feel about the prospect of protecting endangered species from being extinct

A．Worried
B．Optimistic
C．Indifferent
D．Confident
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单项选择题
According to the passage, which of the following is most important in saving declining species
A．governments should make some laws to protect endangered species.
B．People should pay more attention to the protection of natural surroundings.
C．Relevant law must be made and enforced with the support of the people
D．Some organizations should warn people not to trade in endangered animals.
单项选择题
This passage mentions all of the following causes for the extinction of many species EXCEPT
A．natural selection of species.
B．various natural disasters.
C．commercial trade and killing
D．destruction of natural surroundings.
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