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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 bad scientific shortsightedness.
C．Edison agreed with the idea of alternating current.
D．Edison thought heavier-than-air flight impossible.

单项选择题Simon Newcomb concluded in a celebrated essay that ______.

A．the hope that men could fly long distances through the air would remain a dream
B．it is clear that building a machine by which men shall fly long distances is impossible
C．all physical facts have demonstrated that men can not fly long distances through the air
D．men have not yet learned to produce a flying machine with known substances and known forms of machinery and force