问题详情

Questions 3 and 4 are based on the news report you have just heard.
A.Finding cheaper ways of highway construction.
B.Generating electric power for passing vehicles.
C.Providing clean energy to five million people.
D.Testing the efficiency of the new solar panel.
4.
A.They can stand the wear and tear of natural elements.
B.They can be laid right on top of existing highways.
C.They are only about half an inch thick.
D.They are made from cheap materials.请帮忙给出每个问题的正确答案和分析，谢谢！