多选题
Bracken fern has been spreading from its woodland strongholds for
centuries, but the rate of
encroachment into open countryside
has lately increased alarmingly throughout northern and western Britain. A tough
competitor, bracken reduces the value of grazing land by {{U}}crowding out other
vegetation.{{/U}} The fern is itself poisonous to livestock, and also
{{U}}encourages proliferation of sheep ticks{{/U}}, which not only attack sheep but
also transmit diseases. No less important to some people are bracken's effects
on {{U}}threatened habitats and on the use of uplands for recreational purposes,
even though many appreciate its beauty.{{/U}}
The author cites
all of the following as disadvantages of bracken encroachment EXCEPT:
- A. Bracken is poisonous to farm animals.
- B. Bracken inhibits the growth of valuable vegetation.
- C. Bracken indirectly helps spread certain diseases.
- D. Bracken is aesthetically objectionable.
- E. Bracken disturbs habitats that some people would like to
protect.
【正确答案】
D
【答案解析】[解析] 根据题干的关键词“bracken encroachment”回原文定位，阅读定位词附近内容，原文的划线句(even though many appreciate its beauty)与选项D驳斥，因此D选项为正确答案。原文中的“crowding out other vegetation”与B选项同义替换，原文中的“poisonous to livestock”与A选项同义替换，原文中的“transmit diseases”与C选项同义替换，原文中的“threatened habitats and on the use of uplands for recreational purposes”与E选项同义替换。