中国20世纪60年代开始进行海洋油气资源的自营勘探和开发。 A: As early as the 1960s, China began to explore and exploit offshore oil and gas resources on its own. B: Since the 1960s, China began to explore and exploit offshore oil and gas resources on its own. C: Beginning from the 1960s, China began to explore and exploit offshore oil and gas resources on its own. D: Until the 1960s, China began to explore and exploit offshore oil and gas resources on its own.

In terms of equivalent calorific value, the lowest price among coal, oil, natural gas and renewable energy is ( ). A: oil B: coal C: renewable energy D: natural gas

When conventional heating cannot be avoided, the energy carrier will define carbon emissions. What is the order of coal, oil, and natural gas? A: oil < gas

Fossil fuels like coal, oil and natural gas are non-renewable energy sources.

Coal, oil and natural gas are __________ and __________. A: clean ... recyclable B: renewable resource ... unconventional energy C: non-renewable resource ... conventional energy