单项选择题

The population rose fast in the places which had the most ______ soils such as on the flood plains of great rivers.

A．fertile
B．abundant
C．rich
D．barren
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单项选择题
A skilled platform speaker outlines the main points before he ______ the speech.
A．speak
B．talk
C．deliver
D．shift
单项选择题
In order to find an approach ______ with the inconvenient, a world conference net and agreedupon a universal system of standard time.
A．in dealing
B．dealing
C．to dealing
D．to deal
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