单项选择题

The term "mental food" (last sentence) refers to ______

A．books
B．grassland
C．brains
D．subjects
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单项选择题
What does the writer imply according to the passage
A．Male elephants are hunted more than female elephants
B．Both male elephants and female elephants are equally hunted
C．Each elephant has a long life
D．There are not any ivory hunters in the world now.
单项选择题
How much may a tusk in good condition sell for
A．Exactly $2000
B．Almost $2000
C．Nearly $2000
D．$2000 or more
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