单项选择题

I am ______ to Mr. Morrison because of the kindness and concern that he showed me when I first got here.

A．gratified
B．indebted
C．due
D．desirous
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单项选择题
Freud derived psychoanalytic knowledge of childhood indirectly; he ______ childhood processes from adult memory.
A．reconstructed
B．incorporated
C．obstructed
D．fostered
单项选择题
The sheer diversity of tropical plants represents a seemingly ______ source of raw materials, of which only a few have been utilized.
A．exploited
B．controversial
C．inexhaustible
D．remarkable
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