Research has focused on the toxic effects of heavy metals such as lead, cadmium, mercury, and aluminum; however, even copper and zinc, which are essential elements, can become toxic in high concentrations. Although most plants cannot survive in these soils, certain plants have the ability to ...
and research continues to focus on developing salt-tolerant varieties of agricultural crops.Research has focused on the toxic effects of heavy metals such as lead, cadmium, mercury, and aluminum; however, even copper and zinc, which are essential elements, can become toxic in high concentrations....
三个对应点，certain minerals，large quantities和代词others，有mineral的只有A和B两个选项；带入之后发现A是正确的，
and research continues to focus on developing salt-tolerant varieties of agricultural crops. Research has focused on the toxic effects of heavy metals such as lead, cadmium, mercury, and aluminum; however, even copper and zinc, which are essential elements, can become toxic in high concentrations...
and research continues to focus on developing salt-tolerant varieties of agricultural crops.Research has focused on the toxic effects of heavy metals such as lead, cadmium, mercury, and aluminum; however, even copper and zinc, which are essential elements, can become toxic in high concentrations....
afford买得起，能承受，所以offer提供，给出是正确答案。很多物种都生长在热带及亚热带地区，那儿的高浓度金属可以怎么样保护植物免遭吃植物的昆虫的捕食。
Research has focused on the toxic effects of heavy metals such as lead, cadmium, mercury, and aluminum; however, even copper and zinc, which are essential elements, can become toxic in high concentrations. Although most plants cannot survive in these soils, certain plants have the ability to ...
and research continues to focus on developing salt-tolerant varieties of agricultural crops.Research has focused on the toxic effects of heavy metals such as lead, cadmium, mercury, and aluminum; however, even copper and zinc, which are essential elements, can become toxic in high concentrations....