单项选择题

The passage supports the inference that ______.

A．Einstein's theory of relativity is wrong
B．the Lorentz-Fitzgerald formulas contradict Einstein's theories
C．time travel is clearly possible
D．it is impossible to travel at precisely the speed of light

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单项选择题

According to the author, it is too soon to ______.

A．call Beethoven a physicist
B．adopt proposals such as Zuckerkandl's
C．plan for time travel
D．study particle chambers for tachyon traces

单项选择题

The tone of the passage is ______.

A．critical but hopeful
B．hopeful but suspicious
C．suspicious but speculative
D．speculative but hopeful