A. will influence future climate change
B. was somewhat surprising
C. will rise rapidly
D. was known to US all
E. was much higher than had been expected
F. will drop dramatically The increase of greenhouse gases ______.

A．immediately after a period of drought
B．immediately after a period of flood
C．just before a drought struck
D．just before a flood struck

A．finish
B．attend
C．leave
D．cut