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
From William H. Pickering's quotation, we can conclude he thought the use of aero planes was ______.
A．incorrect
B．vague
C．imaginative
D．impracticable
单项选择题
What is the attitude of the committee built by the British Parliament towards Edison's idea
A．Doubtful.
B．Scornful.
C．Critical.
D．Suspicious.
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