乙烯的产量可以用来衡量一个国家的石油化工发展水平，有关乙烯的说法不正确的是（ ）
| A．运输水果常常使用浸有高锰酸钾溶液的硅土处理，目的是使水果保鲜。 |
| B．乙烯分子中只存在碳碳双键 |
| C．乙烯可与氢气、水、溴化氢等物质在一定条件下发生加成反应 |
| D．乙烯是一种植物生长调节剂 |
相关试题
His sister left home in 1998, and _______since. 
| A．had not been heard of | B．has not been heard of |
C．had not heard of | D．has not heard of |
What do you mean, there are only ten tickets? There _____ be twelve
| A．should | B．would |
C．will | D．shall |
Could I speak to ______ is in charge of International Sales please?
| A．who | B．what |
| C．whoever | D．whatever |
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