【单选题】紫茎泽兰是一种侵占性极强的恶性杂草,原产墨西哥,后来作为观赏植物被引进欧洲、澳洲等地。近年来在我国西南部地区蔓延,所到之处粮食减产,牧草退化,人畜过敏甚至中毒。国外一些地区用紫茎泽兰的天敌食蝇来控制它的数量,因此,我国西南部地区引进这种食蝇可以抑制紫茎泽兰的危害。 以上结论是基于以下哪一项假设
A.
在国外某些地区用这种食蝇来控制紫茎泽兰比其他的方法更有效。
B.
这种食蝇能够在中国西南部地区存活下来并吃掉大量的紫茎泽兰。
C.
在中国西南部地区没有与这种食蝇相类似的昆虫。
【单选题】A Tale of Scottish Rural Life Lewis Grassic Gibbon's Sunset Song (1932) was voted 'the best Scottish novel of all time' by Scotland's reading public in 2005. Once considered shocking for its frank des...
B.
The beauty of the sunset.
C.
The new European world.
D.
The lives of rural Scottish farmers.
【简答题】痰液有恶臭味,应考虑感染的病原菌是: 2. 呼吸道以___为界,分为上下呼吸道 3.机械吸痰时每次吸引时间不超过 ___ 4.左、右主支气管分叉水平对应的解剖部位是: 5.大量咯血是指24h咯血量大于 ___
【单选题】A Tale of Scottish Rural Life Lewis Grassic Gibbon's Sunset Song (1932) was voted 'the best Scottish novel of all time' by Scotland's reading public in 2005. Once considered shocking for its frank des...
B.
The beauty of the sunset.
C.
The new European world.
D.
The lives of rural Scottish farmers.
【单选题】A Tale of Scottish Rural Life Lewis Grassic Gibbon's Sunset Song (1932) was voted' the best Scottish novel of all time' by Scotland's reading public in 2005. Once considered shocking for its frank des...
B.
The beauty of the sunset.
C.
The new European world.
D.
The lives of rural Scottish farmers.
【判断题】The Scottish legal system is based on Norman practice, i.e. Case Law.