题目：
作为城市的燃料，天然气比煤炭
A．开采成本低
B．燃烧效率高
C．使用方便
D．对大气污染严重
答案：
BC
根据所学可知，从世界范围看，天然气大规模开发晚于煤炭和石油，天然气的储存、运输,等等方面相对于煤炭困难。天然气燃烧后，生成水与二氧化碳等，燃烧效率高，所以是清洁能源。因此选B、C。
作为城市的燃料，天然气比煤炭 A．开采成本低 B．燃烧效率高 C．使用方便 D．
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