单项选择题

A lot of experiment work is being done to increase own knowledge about insomnia and other sheep - related problems in order to help people who are ______ of sheep.

A．dominated
B．derived
C．distressed
D．bereaved
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______ is known to the world, Hemingway is a great American writer.
A．That
B．As
C．Which
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You should do ______ investigations on this matter.
A．farther
B．much father
C．more father
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