阅读短文，下列问题

     Do you know what Oscar is? When did it start? Maybe you can find the background of the awards in the following passage.

The awards started in 1929. Their full title is “The Academy of Motion Picture Arts and Sciences Awards”. The Academy is a group of people who have worked in the film industry for many years. They decide who will receive the awards. The awards are often referred to as the “Oscar”. This is a nick name given to the awards by a lady called Margaret Herrick. She was once the director of the Academy and she once said that the little gold statue reminded her of her uncle Oscar!

    The Oscar is always an exciting event. Each year, at least one unusual thing happens. When the Italian actor and director Roberto Benigni won an Oscar for best foreign film, he danced on stage! When Gwyneth Paltrow,the star of Shakespeare in Love won the Oscar for best actress, she could not make her acceptance speech because she was crying so much with happiness!

    In 1987, Roberto Benigni won the award for best director for a film about the last emperor of China. Since then, Chinese film and actors have started to make an impact at the awards. Crouching Tiger, Hidden Dragon was a huge success and it won the award for best foreign language film in 2001.It also won several technical awards for its amazing “flying” people. We expect to see more awards for Chinese film in the near future.

    It's time for the Oscar again. Once more, the stars will dress up in their finest and go to Kodar Theater. There, they will find out who have won the awards for best actor, best actress and best director. Millions of people watch the awards every year to find out who the winners are. Some people watch it to see the stars crying and laughing as they receive their awards.

已知：反应I：4NH₃（g）+6NO（g）⇌5N₂（g）+6H₂O（l）△H₁

反应Ⅱ：2NO（g）+O₂（g）⇌2NO₂（g）△H₂（且|△H₁|=2|△H₂|）

反应Ⅲ：4NH₃（g）+6NO₂（g）⇌5N₂（g）+3O₂（g）+6H₂O（l）△H ₃

反应I和反应Ⅱ在不同温度时的平衡常数及其大小关系如下表

（1）△H₃=____ （用△H₁、△H₂的代数式表示）；推测反应Ⅲ是____ 反应（填“吸热”或“放热”）

（2）相同条件下，反应I：4NH₃（g）+6NO（g）⇌5N₂（g）+6H₂O（l）在2L密闭容器内，选用不同的催化剂，反应产生N₂的量随时间变化如图所示．

①计算0～4分钟在A催化剂作用下，反应速率V_（NO）=____ ．

②下列说法不正确的是____ ．

A．单位时间内H﹣O键与N﹣H键断裂的数目相等时，说明反应已经达到平衡

B．若在恒容绝热的密闭容器中发生反应，当K值不变时，说明反应已经达到平衡

C．该反应的活化能大小顺序是：E_a（A）＞E_a（B）＞E_a（C）

D．增大压强能使反应速率加快，是因为增加了活化分子百分数

（3）一定条件下，反应II达到平衡时体系中n（NO）：n（O₂）：n（NO₂）=2：1：2．

①保持恒温恒容，再充入NO₂气体，NO₂体积分数____ （填“变大”、“变小”或“不变”）

②关于平衡体系反应Ⅱ：2NO（g）+O₂（g）⇌2NO₂（g）；△H₂说法正确的是____ ．

A、该反应焓变为负值

B、升高温度，逆反应速率增大，正反应速率减小，反应逆向移动

C、不论增大压强还是减小压强，正方向速率改变的程度更大

D、平衡正向移动，NO的转化率一定增大

E、平衡体系中加入NO₂，平衡逆向移动，△H₂减小

F、混合气体颜色加深说明平衡向右移动，颜色变浅则向左移动．