Please give some information about the dvelopment and changes of protected cultivation from 1980s to the present in China . 2、 Why can we assure that "greenhouse will almost certainly survive?" 3、 what are the three options for supplying fresh vegetables and flowersyear-rould ? 4、 What is the general word-wide trend of the greenhouse ecosystem?Please give some reason。 5、 Which countries have most of the protected cultivation in form of glasshouse ?