听下面一段独白，回答以下小题。
1. Which of the following can prove the air quality in Britain has improved in the last 30 years?

A．Total emissions of smoke in the air have been controlled within 85% since 1960.

B．The dense “ smogs ” of the 1950s haven’t appeared again in major cities except London.

C．Winter sunshine has increased by 70% or so since the late 1950s in central London.

D．The government has successfully taken measures to reduce emissions from new vehicles.

2. What is a new concern for the British people mentioned in the passage?

A．The possible impact of dense “ smogs ” on health.

B．The emissions from a larger number of motor vehicles.

C．The new vehicles adopted to reduce extensively emissions.

D．The pollutants produced by new vehicles and factories.

3. According to the passage, what can be inferred about the Environment Act?

A．It promotes air quality management by structuring a new framework.

B．It provides a national project containing air quality targets for the year 2050.

C．It suggests local institutions bear the duty to monitor air quality in their boundaries.

D．It includes pilot schemes to be taken forward in 40 areas before full implementation.