元素X的单质及X与Y形成的化合物能按如图所示的关系发生转化(其中m≠n，且均为正整数)。下列说法正确的是（      ）

8.465-4.365的得数中的0(    )。

根据短文内容从方框中选择恰当的单词填空，使短文完整、通顺。有的需要变换形式，每词限用一次。

lose,   quick,   pity,   age,   gold,   player,   begin,   win

    Lin Dan is a world-famous badminton (羽毛球)player. He was born on 14th October 1983 in China. He____playing badminton when he was five years old. He played quite well and became the world's No.1 player at the____of 19. He helped China ____ the Thomas Cup and the Sudirman Cup. He ____in the men's singles final at the 2006 Asian Games in Doha. It was a great ____. But two years later, he made up for(弥补)the loss by winning the____medal at the Beijing Olympics. Lin Dan is a left-handed player and he is very____. He is the first badminton____to win a career grand slam(大满贯)：Olympic Games，World Championships，Asian Games，All England Open and all the top world events(比赛项目).

下列与声现象有关的说法中正确的是（　　）

依次填写关联词语正确的一项是（    ）

我们共产党人是彻底的唯物主义者，_______落后和不足是客观存在的，我们_______不能采取极端的态度否认它，躲避它，_______要采取积极的态度。