单项选择题

The deeper the shade of yellow of the olfactory region, （） the sense of smell.

A. is keener
B. keener
C. the keener
D. the keen

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单项选择题
In the 18th century many British politicians favored friendship with Prussia because they thought that the Prussian army was （） to the British navy.

A. complimentary
B. complicated
C. complementary
D. comprehensive
单项选择题
Because of the strong sun the new sitting-room curtains have（）from dark blue to grey.

A． fainted
B． bleached
C． paled
D． faded
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