单项选择题

We (are obliged to) grow up in skepticism, requiring proofs for every assertion about nature, (but) there is no way out (except to) move ahead and plug away, hoping for comprehension in the future (but) living in a condition of intellectual instability for long time.

A．are obliged to
B．but
C．except to
D．but
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单项选择题
Perhaps all societies (are significantly more advanced) than our own have achieved an effective personal immortality and lose the motivation for interstellar gallivanting, which (may), (for all we know), (be) a typical urge only of adolescent civilizations.
A．are significantly more advanced
B．may
C．for all we know
D．be
单项选择题
Two different theoretical explanations seem to be produced by Zimring's analysis. What are they
A．One, to abolish the death penalty; two, to re-introduce it
B．One, to follow historical laws; two, to follow present-day laws
C．One, American attitudes; two, European attitudes
D．One, restriction of government powers; two, 'an eye for an eye' attitude
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