单项选择题

Science and technology have ______ in important ways to the improvement of agricultural production.

A) attached
B) assisted
C) contributed
D) witnessed
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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
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
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