英语句子结构练习. The United Nations held a meeting. Representatives from more than one hundred countries discussed some of the most important problems facing our planet. . Several Earth Summits have been held. Much progress has been made. The Earth Summit was held in Johannesburg in South Africa. One of the main themes of the summit was “sustainable development”. How we can continue developing the world without damaging the environment. Experts from all over the world spok
