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我在A和B犹豫 选择了B 答案A 感觉这里跟2个地方练习都不是很紧密 有什么一语中的非B而A的原因么？谢谢阿
Paragraph5: Scientists have known for some time that certain plants, called
hyper accumulators, can concentrate minerals at levels a hundredfold or greater
than normal. ■ A survey of known hyper accumulators identified that 75 percent
of them amassed nickel, cobalt, copper, zinc, manganese, lead, and cadmium
are other minerals of choice. ■ Hyper accumulators 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 hyper
accumulators. 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.
13. Look at the four squares [ ■ ] that indicate where the following sentence could
be added to the passage.
Certain Certain Certain Certain minerals minerals minerals minerals are are are are more more more more likely likely likely likely to to to to bebebebe accumulated accumulated accumulated accumulated in in in in large large large large quantities quantities quantities quantities than than than than
others. others. others. others.
Where could the sentence best fit? |
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发表于 2012-2-29 22:33:27
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