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托福阅读例文翻译解析：矿物质和植物

2015-01-15 17:39:34来源：网络

　　To show that hyper accumulating plants grow in many regions of the world

　　To explain how zinc contamination can be reduced.

　　Paragraph5: Scientists have known for some time that certain plants, called hyperaccumulators, can concentrate minerals at levels a hundredfold or greater than normal. ■ Asurvey of known hyper accumulators 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 tophyper accumulators. Many are found in tropical and subtropical areas of the world, whereaccumulation 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 could be added to thepassage.

　　Certain minerals are more likely to be accumulated in large quantities than others.

　　Where could the sentence best fit?

　　Directions: An introductory sentence for a brief summary of the passage is provided below.Complete the summary by selecting the THREE answer choices that express the mostimportant ideas in the passage. Some answer choices do not belong in the summary becausethey express ideas that are not presented in the passage or are minor ideas in the passage.This question is worth 2 points.

　　Plants need to absorb certain minerals from the soil in adequate quantities for normal growthand development.

　　●

　　●

　　●

　　Answer Choices

　　Some plants are able to accumulate extremely high levels of certain minerals and thus can beused to clean up soils contaminated with toxic levels of these minerals.

　　Though beneficial in lower levels, high levels of salts, other minerals, and heavy metals can beharmful to plants.

　　When plants do not absorb sufficient amounts of essential minerals, characteristicabnormalities result.

　　Because high concentrations of sodium chloride and other salts limit

本文关键字: 托福阅读例文翻译解析 矿物质和植物

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