红军长征，铸就了伟大的长征精神，长征精神是坚定革命的理想和信念，坚信正义事业（）的精

.国家广播电影电视总局近来重手整治广播影视的低俗风，对重庆电视台、四川人民广播电台和成都人民广播电台制作的某些低级趣味的节目提出通报批评并禁止播出。据有关媒体调查，96.4%的受访者对此举措给予了积极的评价。这说明（       ）

A．落后文化和腐朽文化在我国已经没有市场了

B．人民大众真正需要的都是先进的、健康有益的文化

C．社会主义核心价值体系是和谐文化创新的源泉

D．市场经济自身的弱点会反映到人们的精神生活中来

—I will take an important test tomorrow.       

—Oh, really? ___________!

A．Good luck

B．Congratulations

C．Well done

D．What a pity

Beijing: The United States and North Korea had their first ______ in four months here this afternoon as part of the ______ negotiations on how to end North Korea’s nuclear program, but diplomats played down prospects for______. James A. Kelly, assistant ______, and Kim Yong Ⅱ, North Korea’s deputy foreign minister, met ______ of formal discussions, ______ on direct dialogue that began after a stormy meeting ______ in which North Korea warned that it was moving quickly to ______ nuclear arms. The Bush administration had insisted ______ that it would only hold talks with North Korea ______ because, it argued, only ______ pressure would persuade North Korea to______. It got its way when North Korea dropped its insistence on ______ and agreed, after extensive efforts by China, to hold unusual simultaneous negotiations with ______,______,______ and ______ as well as the United States. Though Bush administration officials had not ______ talking privately with the North Koreans during______, the fact that Mr. Kelly and Mr. Kim met on the first day was seen as a sign of ______ by the American side.

如何理解“随着自然科学领域中的每一个跨时代的发现，唯物主义也必然要改变自己的形式”？

机械中耕除草和人工中耕除草相比，不具备（）的优点。

A、技术先进

B、工作效率高

C、灵活性强

D、作业面积大