某校八年级（2）班的同学们以“***历次重要会议”为主题开展探究活动。他们搜集到这样一则材料：“这次会议作出了实行改革开放的战略决策，是党的历史上具有深远意义的伟大转折。”此处的“这次会议”是 （    ）

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Schedule a Tour

    University of South Carolina （USC) is famous for its warm southern hospitality（好客）. Schedule a visit and feel it in person. Our walking tours are led by current students, called University Ambassadors, who are looking forward to telling you what it's like to live and study in USC. Our walking tours run Monday through Friday and most are around 2 hours. The university will be closed on Tuesday, July 4, 2017 in observance of the holiday. We welcome your visit year round and will be ready for you, rain or shine. Please refer to the list below to determine which tour is best for you and remember to book at least two weeks in advance.

检验下列有机物的方法中正确的是 (　　)

西安事变与重庆谈判都是中国近代史上的重大历史事件，两者的相似点有（    ）

①张学良将军都直接参与其中                    ②***都做出了积极的努力

③国共都达成了反对内战的意向                ④都预示着团结抗日新局面的到来