反应A＋B→C分两步进行：①A＋B→X，②X→C，反应过程中能量变化如下图所示，E1表示反应A＋B→X的活化能。 下列有关叙述正确的是
A．E2表示反应X→C的活化能
B．反应A＋B→C的△H<0
C．X是反应A＋B→C的催化剂
D．加入催化剂可改变反应A＋B→C的焓变
答案：B
题目分析：A、E2表示反应X→C中活化分子变成生成物时放出的能量，而不能表示活化能，A不正确；B、关键图像可知，反应物A和B的总能量高于生成物C的总能量，因此反应A＋B→C的△H＜0，B正确；C、X是反应A＋B→C的中间产物，而表示催化剂，C不正确；D、催化剂只能改变活化能，但不能改变焓变，D不正确，答案选B。
| 阅读下面四篇语言材料,然后按文后要求做题。 | ||
| ||
| 根据材料内容选择最佳答案，并将其标号填入题前括号内。 | ||
| 1. Hong Kong Disneyland _____. | ||
| A. is the first Disney theme park in the world B. looks like a Disney theme park in America C. was built to welcome only Chinese people | ||
| 2. Hong Kong Disneyland was decided to open on 12 September 2005 because _____. | ||
| A. it was a holiday B. of no special reasons C. it was for good luck | ||
| 3. _____ people work in Orlando Disney World. | ||
| A. Five million B. Two hundred thousand C. Thirty-five thousand | ||
| 4. We can infer(推断) from this passage that there are a lot of _____ in Orlando Disney World. | ||
| A. restaurants B. animals C. trains | ||
| 5. Which of the following statements about Orlando Disney World is Not True? | ||
| A. People can take buses to travel around the park. B. The park must be very beautiful and popular. C. About 150,000 people visited the park in 2003. |