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A、B、C、D为初中常见的物质，相互之间的关系如图所示（“—”表示两种物质间能发生反应，“→”表示两种物质间能够转化，部分反应物或生成物以及反应条件已略去）。A是一种气体单质，D是温室气体。

① A的化学式是            ；

 ② B     D的化学方程式是                                   。

答案

（1）①O2    ②2CO +O2 2CO2

D是温室气体初判为CO2，B、C能够转化为CO2，可能是C、CO，因C可够转化为B，故C为C，B 为CO，则气体单质A为O2．

故填：①O2    ②2CO +O2 2CO2

阅读理解
根据短文内容，判断正(T)误(F)。
Dear Jane,
     After I left Paris I spent two days in New York. I got to Miami on Nov.13rd. The weather
is wonderful here. This morning, I met Jennifer Lopez--my favorite movie star. I asked her to
take a picture with me. You know, that was my dream. She agreed! I'm going to show you!
                                                                                                                                         John

Dear Dad,
      I got here at last after 18 hours on a train! It's very cold here in Moscow. It's white everywhere.
This afternoon I went to have a look at the city. I got lost. I'm glad I took Russian lessons in my
university. They helped me a lot. I think I can finish my work here and go back home soon.
     I miss the warm sunshine at home. See you soon.
                                                                                                                                        Max

Dear Amy,
     I arrived in Guilin yesterday. What a beautiful place! The people here are kind and I have some
new friends. Guess who I met here! Tom, my high school classmate. He showed me around the city.
I bought a special bag made in Guilin for you and a silk table cloth for mom. Tomorrow evening I'm
going to fly to Beijing.
                                                                                                                                  Love,
                                                                                                                                  Maria
(     )1. Maria had a good time in Guilin.
(     )2. Maria went to see her classmate in Guilin.
(     )3. It was warm in Max's hometown, but it was cold in Moscow.
(     )4. John was very glad that his dream of going to Paris came true. 
(     )5. Max speaks a little Russian.
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名词解释

范围经济（Economiesofscope）
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