A、It was in the middle of the 1970s.B、It attracted little attention from the public.C、It aimed at raising people's awareness of environmental problems.
（2）、Which of the following environmental problems is NOT mentioned by the speaker?
A、Land use.B、Air pollution.C、Animal extinction.
（3）、What do we know about Earth Day now?
A、It is celebrated on the third weekend of April.B、Now over 175 countries celebrate it.C、Celebrations have greatly changed.
（4）、Who would probably be interested in tomorrow's program?
A、People who like traveling around the world.B、People who want to know more about Earth Day.C、People who care a lot about endangered animals.
