单项选择题

The ozone layer plays as great a role in the stability of spaceship Earth as ______ the waters of its lakes, ponds, oceans, rivers, and streams.

A．do
B．does
C．play
D．are
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单项选择题
______ that the earth was flat
A．Used it to be thought
B．Did it used to be thought
C．Was it used to being thought
D．Does it used to be thought
单项选择题
In proposing (such philanthropic donations), the director of the company certainly spoke (from) a genuine concern (for the needy) and not (any desire) for personal accolades.
A．such philanthropic donations
B．from
C．for the needy
D．any desire
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