7．下列有机化合物有顺反异构体的是

　 A．CH₃CH₃　　　　 　　　　B．CH₂＝CH₂　　　　　　

C．CH₃CH＝CH₂ D．CH₃CH＝CHCH₃

3. 词数：100左右。

When the accident happened I was standing near the bus stop. ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

2. 第一句话已经给出；

75. Albert Einstein made scientific ______ (研究) on physics for years and founded Theory of Relativity.　

第四节 书面表达 (满分30分)

昨天，你在街上目睹了一起事故：一位老人在等车，汽车来后由于车上人多，老人没有上去，而手中的伞和书包被车门夹住，老人被拖倒在地，引起事故。警察向你作现场事故调查，询问事故过程和你对事故责任的看法。请根据下图和提示用英语写出你的回答。

注意: 1. 陈述必须包括图画的内容，可以适当增减细节，使讲话连贯；

74. We must stand ______ (坚定) in the struggle against the western democracy (民主).

73. They stopped ______ (争吵) and worked together in peace.

72. They found some ______ (珍贵) stones while they were digging a well.

71. Human beings all become ______ (逐渐) older.

70. Because of the heavy snow the temperature dropped to minus 10 ______ (度).

69. We listened to her ______ (描述) of the wedding.