题目

In the last few years the popularity of eBooks has exploded. The advantages are clear: You can carry as many books with you as you want. You can simply download even 7 books you like and instantly start reading instead of having to wait for the book to arrive by mail. However, one thing hadn't changed. If you wanted to rent a book you were still forced to use hardcopy books. Until now that is  Amazon. com recently announced the start of a new program where you can rent eBooks. Where to rent eBooks? As mentioned before, Amazon. com is the first and currently the only retailer (零售商28、大气污染与使用能源的种类密切相关。读下图并结合相关知识，回答 减少我国农村大气污染物排放的有效措施有 A．发展沼气         B．开采小煤窑       C．利用太阳能          D．种植薪柴林