被子植物的根、茎、叶、花、果实、种子的形态结构都可以作为分类的依据。

在△ABC中，内角A、B、C所对的边分别是a、b、c，已知3asinC=ccosA．

（Ⅰ）求sinA的值；

（Ⅱ）若B= $\frac{\pi }{4}$ ，△ABC的面积为9，求a的值．

2017年1月10日，教育部明确要求，将8年抗战一律改为14年抗战，同时要求在2017年春季教材中全面落实14年抗战概念，修改覆盖中小学所有学校、所有相关学科、所有国家课程和地方课程的教材，这一修改的主要意义在于（    ）

根据短文内容和首字母提示，在下文空格处填入适当的词使短文完整。在标有题号的横线上，完整写出空缺处所填单词的正确形式。
       Remember to be a good boy or a girl any time. It's i____  to have good manners, especially in some p____ places. When you are waiting in line, don't jump the queue. Be p____ . Don’t stand too close to others in the line. Keep 20cm a____  if you can.
     F____  the advice of the workers when your are having a visit on a place of interest. Do not climb on exhibitions. Make s____ it's OK to take pictures before you hold up your camera. When you go to shows, w____  clean clothes. You should get to the show 15 minutes before it starts. During the shows, turn o____ your cell phone. Don't eat during the show. Restaurants will be quite busy. Don't stay too long when you finish eating. Remember to t____ your rubbish away after the meal.
    Good manners can make you a g____ or a lovely lady. Wherever you are, others will be pleased with you.

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