多项选择题

If you had________ (听从了我的忠告，你就不会陷入麻烦).
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单项选择题
What does the author mean by passive enjoyment in the last paragraph
A．We do nothing at all.
B．We accept whatever the TV tells us as truth.
C．We are content with second-hand experience and do not go into the world itself.
D．We do whatever the stars in TV programs tell us to do.
单项选择题
The greenhouse effect resulted hundreds of million years ago when _________.
A．the atmosphere changed dramatically
B．oxygen levels on the earth became lower
C．the sea levels became lower greatly
D．the sediment gave off enormous carbon and methane
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