单项选择题

From ancient times, the valley of the Nile has been made ______ by the river floods.

A. famous
B. deserted
C. attractive
D. fertile
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To an especially sensitive child, a simple scolding can be a ______ experience.
A. hysterical
B. grievous
C. gracious
D. sensible
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The two scholars worked at the task of writing a preface to the new dictionary for three hours ______ last night.
A. at length
B. in full
C. on end
D. in time
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