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孩子们准备过年，第一件大事就是买杂拌儿。这是用花生（）胶枣（）榛子（）粟子等干果与蜜饯掺和成的（）孩子们喜欢这些零七八碎儿。第二件大事是买爆竹，特别是男孩子们。恐怕第三件才是买各种玩意儿——风筝、空竹、口琴等。

根据材料内容，选择正确答案。

Dear Frank,    

    Thank you for your postcard. I'm very glad you are having a good trip now. Ottawa is very beautiful in May. I hope I will have a chance to go there one day.

    Our summer holidays will start next month. I enjoy my summer holidays, although(虽然)it's hot at that time in America. During summer holidays，I can swim in the sea and go fishing. It's so cool. And I am going to our hometown near Chicago with my sister Linda，and my parents agree(同意). Our uncle lives  there，so Linda and I can stay with him.

    We are not going to take a plane. We are going there by train. I am going to fish there. And Linda likes painting. She is going to do some painting there. I'm sure we'll have a good time.

                                                            Sincerely,

                                                              Jack

由$A=\frac{2\mathrm{\pi }}{3}$=1，d=3确定的等差数列$\sin B+\sin C=\sin B+\sin (\frac{\mathrm{\pi }}{3}-B)$，当$=\frac{1}{2}\sin B+\frac{\sqrt{3}}{2}\cos B$=298是，n等于（  ）

贝壳堤由死亡的贝类生物在海岸带堆积而成，在沿海地区经常分布着多条贝壳堤，标志着海岸线位置的变化，下图示意渤海湾沿岸某地区贝壳堤的分布。

根据材料回答下列问题：

西部网讯3月11日，在陕西广播电视台“全国两会”演播室里，全国人大代表、中国工程院副院长徐德龙和全国政协委员马玉红就治理雾霾，我们每个人该怎么做这一问题展开讨论．雾霾治理难度大，难在哪？难在一方面我们要保持中高速发展，一方面又要治理污染．针对这个难题，需要独特的创新驱动发展战略，治理雾霾就跟治病一样，关键要依靠科技进步，从源头上治理，从本源上治理．