题目

在化学反应中，只有极少数能量比平均能量高得多的反应物分子发生碰撞时才可能发生化学反应，这些分子被称为活化分子。使普通分子变成活化分子所需提供的最低限度的能量叫活化能，其单位通常用kJ·mol－1表示。请认真观察下图，然后回答问题。（1）下图中所示反应是________(填“吸热”或“放热”)反应。 （2）已知拆开1mol H—H键、1mol I—I、1mol H—I键分别需要吸收的能量为436kJ、151kJ、299kJ。则由1mol氢气和1mol 碘反应生成HI会____(填“放出”或“第二部分   阅读理解 （共25小题。第一节每小题2分，第二节每小题1分；满分45分） 第一节   阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。 A One night, Mrs. Riley, an elderly woman, was walking along a dark London street. She was carrying her handbag in one hand and a plastic carrier bag in the other. There was nobody else in the street except two youths. They were standing in a dark shop doorway. One of them was very tall with fail hair, the other was short and fat with a beard. The youths waited for a few moments, and then ran quickly and quietly towards Mrs. Riley. The tall youth held her from behind while the other youth tried to seize her handbag. Suddenly, Mrs. Riley threw the tall youth over her shoulder. He crashed into the other youth and they both landed on the ground. Without speaking, Mrs. Riley struck both of them on the head with her handbag and walked calmly away. The two surprised youths were still sitting on the ground when Mrs. Riley crossed the street towards a door with a lighted sign above it. Mrs. Riley paused, turned round, smiled at the youths and walked into the South West London Judo（柔道）Club. The two youths stood in a dark shop doorway because _____.    A. they had nothing to do              B. they were homeless  C. they meant to rob somebody          D. they were guarding the shop What did Mrs. Riley do to the two youths?  A. She hurt them seriously.            B. She taught them a lesson. C. She reported them to the police.    D. She sent them to a judo club. The story tells about an elderly woman who _____. A. often went shopping at night        B. was brave and wise C. worked in a shopping center         D. had a skill of self–defense