单项选择题

People decided to honor Edison when ______.

A．he made his electric light
B．the first invention was made
C．he died more than 70 years ago
D．the country realized the importance of electricity
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单项选择题
What does “dim” (Line 1, Para. 3 ) mean
A．To make less bright.
B．To make more bright.
C．To mm on.
D．To mm off.
单项选择题
That suggestion plan was never carded out because _______.
A．it was difficult
B．it wasn't right
C．not everyone agreed on the suggestion plan
D．electric power was too important to the country
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