The ice sheets are melting and sea levels are rising a metre a year.
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A、a. as a means of raising revenue for public purposes.
B、b. when policymakers believe that the market price of a good or service is unfair to buyers or sellers.
C、c. when policymakers detect inefficiencies in a market.
D、d. All of the above are correct.
A、We have stopped driving cars.
B、We do not burn so much fossil fuel.
C、We have reduced 80% of the cars on the roads.
A、We now use alternative forms of energy.
B、We now use alternative forms of transport.
C、We only have three billion cars on the road.
A、Gas is a form of alternative energy.
B、Alternative forms of energy are clean.
C、Nuclear technology started to develop 8 decades ago.
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