单项选择题

In the Mediterranean seaweed is so abundant and so easily harvested that it is never of great ______

A) fare
B) payment
C) worth
D) expense
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单项选择题
It is clear that the dog has a much greater ______ of its brain devoted to smell than is the case with humans.
A) composition
B) compound
C) percent
D) proportion
单项选择题
First published in 1927, the charts remain an______ source for researchers.
A) identical
B) indispensable
C) intelligent
D) inevitable
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