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
She is furious (of) her son's grades in school, (which) explains why Mark is jealous (of) Julia's high marks (on) the exam.
A．of
B．which
C．of
D．on
单项选择题
(Police) were sent to disperse the crowds but ended up (by shooting) down protesters and it was in (this) chaos that the seeds of political liberation were (sown).
A．Police
B．by shooting
C．this
D．sown
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