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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单项选择题
In the last sentence of the second paragraph, the word “islands” refers to
A．the lands that are completely surrounded by water.
B．the wild animals’ breeding grounds protected by law.
C．the pieces of land separated by modern buildings and roads.
D．the small and isolated areas inhabited by certain species.
单项选择题
The government may reduce taxes in a recession in order to _________.
A．apply to all businesses.
B．raise the GDP.
C．state and city government
D．reduce spending
E．modify fluctuations in the business cycle
F．produce and sell goods
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