单项选择题

A thorough study of biology requires（）with the properties of trees and plants, and the habit of birds and beasts.

A. acquisition
B. discrimination
C. curiosity
D. familiarity

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单项选择题
Five score years ago, a great American, （）symbolic shadow we stand, signed the Emancipation Proclamation.

A. with his
B. in whose
C. by him
D. of whom
单项选择题
That Pacific is land attracts shoals of tourists with its rich（）of folk arts

A. heritage
B. heredity
C.heroism
D.hermitage
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