单项选择题

A．that
B．because
C．if
D．when
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单项选择题
What’s the major cause in the decline of Asian elephants
A．Their taming for circuses and zoos.
B．The destruction of their natural homes.
C．Man’s lack of knowledge about their behavior.
D．The greater vulnerability to extinction than other species.
单项选择题
Why does the speaker cite the example of graffiti in the London underground
A．To show that mindless graffiti can provoke violence.
B．To show that Londoners have a special liking for graffiti.
C．To show that graffiti, in some cases, can constitute a crime.
D．To show that graffiti can make the environment more colorful.
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