听力音频：

• Aim in the UK is to reduce carbon emissions from energy consumed in 31 ……………… by approximately 25%.
• Most popular ‘green’ energy: 32 ………………
• Little investment in heat pumps in the UK due to lack of 33 ……………… in using them.

• Heat pumps serve the same purpose as a 34 ………………
• Most heat pumps get heat from the earth or the 35 ………………
• Water is heated to 60°C to destroy 36 ………………

• 83 sites across the UK.
• Central heating systems monitored: 37 ……………… and under-floor heating.

• Installation: Need to provide improved 38 ……………… in pump-fitting technique.
• 39 ……………… designs performed best.
• Customers needed to be told about regulating the controls.
• Need for a 40 ……………… to coordinate the installation.

答案