单项选择题

The word "nosedived" ( Line 3, Para. 1 ) most probably means "______"

A．dropped
B．rose up
C．steadied
D．changed
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单项选择题
Which of the following is TRUE according to the passage
A．Edison's electric bulb was once regarded by some British "experts" as good enough only for Americans.
B．Edison always had scientific shortsightedness.
C．Edison agreed with the idea of alternating current.
D．Edison thought heavier-than-air flight impossible.
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