单项选择题

The author's main purpose in writing this passage is to ______.

A．report the progress of some new events
B．criticize extreme and violent actions
C．recall a certain period of American history
D．tell his readers not to be afraid of globalization

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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

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