单项选择题

Our experiment was conducted under optimal conditions. The underlined part means ________.

A．perfect
B．proper
C．possible
D．proposed
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单项选择题
At the beginning of the passage, the author uses figures for the purpose of （）

A．introduction
B．comparison
C．explanation
D．transition
单项选择题
The employers prepared, with all due ________ for a conference with the Trade Unions.
A．caution
B．concern
C．certainty
D．consideration
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