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No sooner（）(we arrive) at our house than it started to rain.

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A．脂水分配系数与毒效应B．分离度与毒效应C．挥发度和蒸气压与毒效应D．分散度与毒效应E．纯度与毒效应商品乐果的大鼠经口LD50为247mg/kg，而纯品乐果则为60mg/kg（）

A. 脂水分配系数与毒效应
B. 分离度与毒效应
C. 挥发度和蒸气压与毒效应
D. 分散度与毒效应
E. 纯度与毒效应

[听力原文]11-15Venice is a fascinating city between sea and sky. It is built on 117 islands. There aren’t any cars and buses, But it has 150 canals and 400 bridges. The narrow streets, with their historic names, are paved with stones but have no footpaths. They are lined with flower, shops and lights side by side. The squares are charming, The brick bridges are built high to; allow boats to pass tinder them.Every year thousands of tourists front the five continents visit this city. They are always amazed at the charm of her water and beautiful lights, which can make them free from all dust and cooled by the sea breezes.But because the level of the surrounding waters is constantly rising, the Venice faces a threat to its Very existence. And the Venetian love their city and want to stay there to save the Venice from the sea, Now various methods hove already been taken and a plan to protect the city is under investigation. Now what steps have already been taken to protect the city

A．IL-1 B．IL-2C．IL-3 D．EPOE．IFN-α 促进红细胞生成的是（）

A. IL-1
B. IL-2
C. IL-3
D. EPO
E. IFN-α

某地为了了解新研制的流感气雾免疫制剂的效果，在本地随机确定5000人接种疫苗，另外5000人不接种该疫苗作为对照，经过一个流行期后，前者50人发病，后者500人发病，则该疫苗的保护率为

A. 10%
B. 10
C. 2.7%
D. 90%
E. 以上都不对