3． 20世纪80年代以来，我国工业化持续迅速发展，对其发展原因归纳最准确的是(　　 )

①以经济建设为中心　　 ②对外开放　 ③深化经济体制改革　 ④国内稳定的政局

A．①②　　 B．②③④　　 　　

C．①③④　 　　　 D．①②③④

2．十一届三中全会实现了政治路线的拨乱反正，主要是指(　　 )

A．重新确立解放思想，实事求是的指导思想　

B．把工作重点转移到社会主义现代化建设上来

C．形成以邓小平为核心的中央领导集体

D．做出实行改革开放的伟大决策

1．在《改革开放三十年回眸》图片展中，下列图片最有可能入选的是

A．“东方红一号”发射成功　　　 B．周恩来会见美国国务卿基辛格

C．袁隆平培育出籼型杂交水稻　　 D．邓小平关于“三个面向”教育方针的题词

46. 解：原式·································································· (8分)

．　　 (2分)

45. 解：原式=

　　　　 =

43. -2b

　　　　 = ··································································································· (6分)

42. 解：原式＝1+3－1＝3

41. 解：原式＝－2

40. 解：原式＝2+1－9+1 ································································································ 4分

　　　　　　 ＝－5　······································································································ 6分

39. 解：