下列为三种微生物示意图，有关叙述错误的是（    ）

要弘扬伟大的民族精神，就要（  ）
①正确认是祖国的历史和现实           ②增强热爱祖国的情感和振兴祖国的责任感
③树立民族自尊心和自信心               ④真正把爱国之志变成报国之行

During his first trip to China, President Obama discussed some key global issues such as economic recovery, climate change, _______ nuclear weapons in his talks with Chinese President Hu Jintao.

2的相反数是（   ）

动脉里流动的是动脉血，静脉里流动的是静脉血。（判断对错）