反应A（g）+B（g）→C（g）△H，分两步进行：①A（g）+B（g）→X（g）△H₁，②X（g）→C（g）△H₂，反应过程中能量变化如图所示，E₁表示A（g）+B（g）→X（g）的活化能，下列说法正确的是（   ）

用铁片与稀硫酸反应时，下列措施不能使反应速率加快的是

直线的倾斜角为，则的值为(    )

根据短文理解，回答下列问题。
Cyber Boy   5-26-2013   2:15 pm
    Hi, I'm planning a trip to Europe this summer. I haven't decided where to go yet, but I'd like to experience Britain and France. And I don't want to spend too much money. Any ideas?
Esperanto   5-26-2013   2:23pm
     I had a tour to Britain last year. It's a very nice place. I had a great time there. If you get a chance, visit Stratford. That's the town where Shakespeare lived.
Yoshi   5-26-2013   2:28 pm
    First you should make sure what you want to do there. Each country in Europe has so much to see. Are you interested in museums and castles（城堡）? Or do you want to get to know anything modem?
Cyber Boy    5-26-2013   3:02 pm
    Yoshi -- Good question. I'd like to see some museums, but I also want to try some of French famous food, and a castle would also be great.
Yoshi   5-26-2013   3:21 pm
    I think an English-France-Germany trip might work well for you. You can do a little bit of everything. That's wonderful.
Esperanto   5-26-2013   3:38pm 
    It's easier to say than to do. It will need a lot of money and take time. Cyber Boy isn't so rich. I think he'd better go to France first this time and he is still able to travel to England or Germany in the future if possible.
Yoshi   5-26-2013   3:54pm
     Esperanto --That sounds OK. But I'm not sure if he will have another trip to Europe.

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