根据你对化学反应的理解，回答下列问题：人类利用化学反应，可以

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问题问答题

根据你对化学反应的理解，回答下列问题：人类利用化学反应，可以得到有用的______或获取______．另外，人类还利用化学反应消除有害物质．

答案

随着经济的发展，自然界中的天然物质不能满足人类生活和生产的需要，所以人类利用化学反应获取生活和生产所需的物质和能量，同时人类还利用化学反应消除有害物质．

故答案为：物质；能量．

阅读理解

阅读并给以下五个段落排序，将每个段落前的标号填入下方横线的相应位置。

A. "I was happy and excited during the exam, because I felt my teachers now trusted me," said Lang Yudan, a

13-year-old girl in Class 11.

B. Before the exam, students had to promise (承诺) they would not cheat (作弊).

C. The school says no cheating happened in the test. Next year, it wants 80percent of its exams to be without

teachers.

D. Have you ever wanted to stop teachers watching you in exams? Well, that has come true for students at the

Affiliated Middle School to Northeast Normal University (东北师大附中) in Changchun, Jilin.

E. Last week, 169Junior 1 students there took their first no-teacher exam. After the teacher handed out the

exam papers, he left the room and never came back. A student collected the papers when the exam ended.

1. 2. 3. 4. 5.

问答题

(一)题5-1～题5-4，根据三视图画出正等轴测图。