根据首字母或汉语提示写出单词。

1. In b______ class, we learn much about animals and plants.

2. My classmate, Liu Peng won the first prize in yesterday’s ______ (演讲)contest.

3. Mr. Zhang was______ (缺席)from the meeting yesterday. What happened to him?

4. At p______, people in China are busy building an energy saving(节约型)s_____.

5. As We know, Heroin (海洛因) is a kind of bad d ______.

列车运行监控记录装置机车速度控制模式，对于道岔和临时施工慢性引起的列车限速，特殊规定为，当列车运行速度达到（）时实施报警。

A、列车限速值

B、列车限速值＋1km/h

C、列车限速值＋2km/h

D、列车限速值＋3km/h