单项选择题

Questions 31-40
Choose the correct letter, A, B or C.
What can exchange the pattern of atmospheric circulation

A．carbon-dioxide effect
B．extreme regions
C．planet change
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According to physics warm air has more
A．oxygen.
B．moisture.
C．dust.
单项选择题
36 What is the main suspect that led to unprecedented extreme weather event
A．human emission
B．satellite measure
C．animal destroy
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