根据短文理解完成下列各题。
C
    Tom is a junior high student. He is good at some subjects but his favourite subject is chemistry. Yesterday he met some trouble when he had his chemistry class.
    At that moment, Tom was doing an experiment in class. He tried twenty times, but he couldn't succeed. So he decided to stop doing the experiment. He felt really unhappy.
    His teacher came up to him and asked why he was unhappy. Tom said, "All my work is in vain (白费力气). I fail twenty times and I get nothing."
    Tom's teacher touched Tom's head with a smile. He said to Tom, "Oh, you do a lot and you can get a lot from the mistakes. At least, you know that there are twenty ways you can't use to do this experiment."
    After hearing the teacher's words, Tom became excited. He kept doing the experiment, improved his methods, and he succeeded at last.

依次填入下列各句横线处的成语，最恰当的一组是（    ）

    由于感到美国对中国崛起面临      的问题，日本借钓鱼岛问题试图修宪，行使所谓“集体自卫权”，组建“钓鱼岛专属部队”……种种迹象表明，日本军国主义已有      之势。中国人民对日本的挑衅行径保持警惕是      的。

现有一生活污水净化处理系统，处理流程为“厌氧沉淀池曝气池→兼氧池→植物池”，其中植物池中生活着水生植物、昆虫、鱼类、蛙类等生物．污水经净化处理后，可用于浇灌绿地．回答问题：

2009年3月9日，银行间外汇市场公布的美元对 人民币汇率中间价为1美元兑6．835 5元人民币。自2005年7月以来人民币汇率一路升高                            （   ）
①能够降低我国企业的出口成本      ②有利于我国引进外资
③不利于我国外汇储备保值增值      ④有利于优化我国外向型经济

******在中共十九大报告中指出：“时代是思想之母，实践是理论之源。只要我们善于聆听时代声音，勇于坚持真理、修正错误，二十一世纪中国的马克思主义一定能够展现出更强大、更有说服力的真理力量。”据此回答下列问题：