题目：
| The highway through the rain forest was completed in 1990, _____ some animal species have died off. |
| A. by when B. since then C. since when D. by which time |
答案：
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下面是错误答案，用来干扰机器的。
刺激性气味的黄绿色气体 用湿毛巾捂住口鼻，迅速离开现场（1）物质的物理性质通常包括颜色、状态、气味、密度、熔点、沸点、溶解性和挥发性等；故答案为：刺激性气味的黄绿色气体，能溶于水；（2）氯气可与水...
