单选题
Can people now living on this planet improve their lives, not at the expense of future generations, but in a way from which their children and grandchildren will benefit?
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【正确答案】
【答案解析】如今居住在地球上的人们能以一种造福子孙而不损害子孙后代利益的方式改善他们的生活吗?[解析] living on this planet现在分词短语作people的定语；not…but…意为“不是……而是……”；at the expense of future generations意为“以损害子孙后代的代价”；from which their children and grandchildren will benefit是带介词from(benefit from)的定语从句。