题目

听下面一段较长的对话，回答问题。 （1） What is Jacob doing? A . Reading an article. B . Watching a movie. C . Doing a report. （2） What did Sarah do? A . She opened a company. B . She created a website. C . She protected animals. （3） How many trees have they planted? A . More than 10,000. B . About 1,000. C . Less than 100. 答案：A B A观察如图，化石燃料在燃烧过程中会产生各种废气，其中形成酸雨的主要气体是（ ）A．SO2、NO2B．CO2、COC．SO2、CO2D．NO2、CO