单项选择题

The phrase "brought on" (Line 1, Para 4. ) most probably means _________.

A.cause to happen
B.accelerate
C.diminish
D.sustain
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单项选择题
According to Peter Ward's research, _________.
A.90% of animals and plants went extinct 250 million years ago
B.dinosaurs died off as a result of meteor impacts
C.the "Great Dying" has much to do with volcanic activity
D.global warming played a minor part in the "Great Dying"
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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