National parks are places to be treasured—places     1     the country locks away the very best it has to offer for everyone to enjoy. Not all famous national parks are on land. One good example is the Great Barrier Reef Marine Park in Australia.     2     (stretch)over 2,300 kilometers, the Great Barrier Reef is considered one of the natural     3     (wonder)of the world. The park was created in 1975 to protect the reef from overdevelopment and fishing. Unfortunately, the biggest danger to it is global warming,     4     park management cannot stop.

In 2016, Shennongjia made it onto the UNESCO World Heritage List. It     1     (contain) a naturally-balanced environment that allows the many and various species to live and prosper. It is also one of the rare locations in the world     2     scientists can observe in real time the ecological and biological processes that occur as the plants and animals develop and evolve. The most impressive aspect of Shennongjia is the local people,     3     take things from nature without causing damage.