依次填入下列横线处的词语，最恰当的一组是（    ）

    孙犁在给贾平凹的散文集《月痕》作的序中，更是          地指出：文艺之途正如人生之途，过早的金榜、骏马、高官、高楼，过多的花红热闹，鼓噪喧腾，并不一定是好事。人之一生，或是作家一生，要能经受得         和寂寞，忍受得污蔑和凌辱。要之，在这条道路上，冷也能安得，热也能处得，风里也来得，雨里也去得。在历史上，到头来退却的，或者说是          的，常常不是坚定的战士，而是那些跳梁的小丑。这样的文字，不啻为人为文的至理名言。

    Before you go to another country it is a great help if you know the language and some of the customs of the country.
    When people meet each other for the first time in Britain, they say “How do you do?” and shake hands. Usually they do not shake hands when they just meet or say goodbye. But they shake hands after they haven't met for a long time or when they will be away from each other for a long time.
    Last year a group of German students went to England for a holiday. Their teacher told them that the English people hardly shake hands. So when they met their English friends at the station, they kept their hands behind their backs. The English students had learned that the Germans shake hands as often as possible, so they put their hands in front and got ready to shake hands with them. It made both of them laugh.

继中美轮胎特保案后，2009年11月24日，美国商务部作出终裁，对中国油井管相关产品实施10.36％至15.78％的反补贴关税制裁，中国坚决反对这种滥用保护主义的做法。尽管中美之间存在贸易摩擦等矛盾，但不可否认，中美仍是重要的贸易伙伴。这启示我们 

先化简，再求值：（ $\frac{3x}{x-2}$ ﹣ $\frac{x}{x+2}$ ）÷ $\frac{x}{x^2-4}$ ，在﹣2，0，1，2四个数中选一个合适的代入求值．

“请君莫畏大炮子，百炮才闻几个死?……我所畏者鸦片烟，杀人不计亿万千。……不知吃烟肠胃皆熬煎……不知买烟费尽囊中钱。”这段材料揭示了(    )