在一个容积固定的反应器中，有一可左右滑动的密封隔板，两侧分别进行如下图所示的可逆反应。各物质的起始加入量如下：A、B和C均为4．0 mol，D为6．5 mol，F为2．0 mol，设E为x mol。当x在一定范围内变化时，均可以通过调节反应器的温度，使两侧反应都达到平衡，并且隔板恰好处于正中位置。请填写以下空白：
（1）若x=4．5，则右侧反应在起始时向__________（填“正反应”或“逆反应”）方向进行。欲使起始反应维持向该方向进行，则x的最大取值应小于__________。
（2）若x分别为4．5和5．0，则在这两种情况下，当反应达平衡时，A的物质的量是否相等?__________（填“相等”“不相等”或“不能确定”）。其理由是_______________________。
（1）正反应（2分） 7．0（3分）
（2）不相等（2分）两种情况是在两个不同温度下建立的化学平衡,平衡状态不同,所以物质的量也不同．（不从温度角度说明不得分）（3分）
| 阅读理解。 |
| 150 Years of Cool Look in the bedrooms of young people around the world. You will probably find a pair of blue jeans in each room. Jeans are very popular all over the world. Jeans give you the feeling of comfort, youth and energy. They have long been liked by every person. Levi Strauss is an American company. It first made blue jeans. The company was founded in 1853 by 24-year-old Levi Strauss. Twenty years later, he made the first blue jeans in the world. The jeans were used as working trousers for the cowboys of the American West. During the Second World War, American soldiers brought blue jeans to Europe and Asia. People there began to wear jeans. Little by little, they become cool. People from different countries like different styles of jeans. Americans like to wear simple and single- colored jeans, but many Chinese like to wear jeans with lots of different colors. Jeans now can be seen everywhere. However, in many places, it's not always good to wear jeans. No matter how good they may look, or what color they are, it's often not right to wear jeans in formal places. But, when you are out, relaxing and having fun, jeans are the best choice. |
| 1. The story is talking about ______. |
[ ] |
| A. Levi Strauss B. young people C. cool D. jeans |
| 2. Levi Strauss made the first blue jeans ______. |
[ ] |
| A. when he was 44 B. when he was 24 C. in 1853 D. in 1924 |
| 3. ______ wore jeans after they were first made. |
[ ] |
| A. American soldiers B. American cowboys C. Levi Strauss D. The people in Europe |
| 4. Jeans can be cool for nearly 150 years because ______. |
[ ] |
| A. they have different styles B. they have different colors C. they make us feel youth, comfort and energy D. they are working trousers |
| 5. When you ______, you'd better not wear a pair of jeans. |
[ ] |
| A. go to an important meeting B. go on a trip C. have a party D. are having fun |