词汇：
同素异形体 ____；氨 ____．铝 ____；合金 ____；氯气 ____；reducing agent ____；amphoteric ____；oxidation ____；Silicon ____；acid rain ____
下列选项中属于刑罚主刑的有（ ）
A．酚酞试液 B．石蕊试液
C．稀盐酸 D．____
“钟山风雨起苍黄,百万雄师过大江”描述的历史事件是 ( )
阅读短文，回答问题。
It's eight o'clock. The children go to school by car every day. But they are walking to school today. It's ten o'clock. Mrs. Green usually(通常) stays at home in the morning. But she is going to the shops this morning. It's nine o'clock. Mr. Green usually reads his newspaper at night(晚上). But he is reading an interesting(有趣的) book this evening.
