Climate change, once just a guess by people, now has become reality.

A．more sure about them
B．less sure about them
C．more hopeful of reaching a satisfactory answer
D．completely disillusioned about ever reaching a satisfactory answer

A．be interested in partisanship and special interest
B．be independent of the government financially
C．be independent of any political control or private interests
D．be sources of judgment for our politicians