2. 外语
  3. 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

admin2014-09-29  69
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.
Look at the four squares[]that indicate where the following sentence can be added to the passage.
Certain minerals are more likely to be accumulated in large quantities than others.
Where would the sentence best fit?
选项 A、Scientists have known for some time that certain plants, called hyperaccumulators, can concentrate minerals at levels a hundredfold or greater than normal. Certain minerals are more likely to be accumulated in large quantities than others. 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.
B、Scientists have known for some time that certain plants, called hyperaccumulators, 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. Certain minerals are more likely to be accumulated in large quantities than others. 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.
C、Scientists have known for some time that certain plants, called hyperaccumulators, 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. Certain minerals are more likely to be accumulated in large quantities than others. 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.
D、Scientists have known for some time that certain plants, called hyperaccumulators, 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. Certain minerals are more likely to be accumulated in large quantities than others. 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.
答案A
解析
转载请注明原文地址:https://kaotiyun.com/show/qGfO777K
0

托福（TOEFL）

相关试题推荐
随机试题
最新回复(0)