英语具体句子提问Oxfam says Niger is at the height of a months-long f

英语具体句子提问Oxfam says Niger is at the height of a months-long food crisis.An earlier severe drought destroyed crops,and now heavy rains are ruining what little was left."It is wiped out many crops and vegetable gardens so it has actually destroyed their one hope,which is having some food that they could sell now on the market or having crops that they could harvest at the end of September,October,so people are extremely desperate," said Oxfam's Caroline Gluck in Niger.wipe out为什么要用被动形式?could sell...这里could和can有什么区别吗-------------------------------------------------------------------------------Gluck says Niger is not set up to cope with erratic weather conditions.Many people,she says,live in adobe-style mud or bamboo huts that do not withstand the rain.Niger is not set up to...,这里的set up是指什么,不像是建立----------------------------------------------------------------"They have very little to protect themselves and very little warning that major flooding is about to happen." they have very little to protect,这个怎么翻译?have very little to do是固定句式?为什么set up那里要用被动形式呢