A．Because the new industries they want to attract do not cause much pollution.
B．Because pollution is not a serious problem for developing countries.
C．Because they don’t realize that the balance of nature will be disturbed by some pollutants.
D．Because if they put strict control on industry, fewer companies would build new plants in developing countries.

A．It’s a new method to measure a country’s production.
B．It’s a way to study the economies of different countries.
C．It’s a new system to help make economic decisions.
D．It’s a means to understand a country’s economic changes.