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Scientists have known for some time that certain plants, called hyperaccumu-lators, can concentrate minerals at levels a hundred
Scientists have known for some time that certain plants, called hyperaccumu-lators, can concentrate minerals at levels a hundred
admin
2014-09-29
79
问题
Scientists have known for some time that certain plants, called hyperaccumu-lators, can concentrate minerals at levels a hundredfold or greater than normal. A survey of known hyperaccumulators identified that 75 percent of them amassed nickel; cobalt, copper, zinc, manganese, lead, and cadmium are other minerals of choice. Hyperaccumulators run the entire range of the plant world. They may be
herbs
,
shrubs
, or
trees
. Many members of the mustard family, spurge family, legume family, and grass family are top hyperaccumulators. Many are found in tropical and subtropical areas of the world, where accumulation of high concentrations of metals may
afford
some protection against plant-eating insects and microbial pathogens.
The word "
afford
" in the passage is closest in meaning to
选项
A、offer
B、prevent
C、increase
D、remove
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/iGfO777K
0
托福(TOEFL)
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