英语听力精选进阶版 14457（在线收听）

Cheap solar energy

Vocabulary

toxic

poisonous; able to cause illness or death

compound

a chemical that contains two or more elements

ensuing

happening as a result of

competitive

(of goods or services) as cheap or cheaper than

fossil fuel

source of energy formed from plants and animals which died millions of years ago (such as oil, coal and gas)

on an industrial scale

in large quantities

steadily

slowly but continuously