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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

　　According to Paragraph2, which of the following symptoms occurs in phosphorus-deficientplants but not in plants deficient in nitrogen or iron?

　　Chlorosis on leaves

　　Change in leaf pigmentation to a dark shade of green

　　Short, stunted appearance of stems

　　Reddish pigmentation on the leaves or stem

　　According to Paragraph2, a symptom of iron deficiency is the presence in young leaves of

　　Deep red discoloration between the veins.

　　White or yellow tissue between the veins.

　　Dead spots between the veins.

　　Characteristic dark green veins.

　　Paragraph3: Much of the research on nutrient deficiencies is based on growing plantshydroponically, that is, in soilless liquid nutrient solutions. This technique allows researchersto create solutions that selectively omit certain nutrients and then observe the resultingeffects on the plants. Hydroponics has applications beyond basic research, since it facilitates thegrowing of greenhouse vegetables during winter. Acroponics, a technique in which plants aresuspended and the roots misted with a nutrient solution, is another method for growingplants without soil.

　　The word facilitates in the passage is closest in meaning to

　　slows down

　　affects

　　makes easier

　　focuses on

　　According to Paragraph3, what is the advantage of hydroponics for research on nutrientdeficiencies in plants?

　　It allows researchers to control what nutrients a plant receives.

　　It allows researchers to observe the growth of a large number of plants simultaneously.

　　It is possible to directly observe the roots of plants.

　　It is unnecessary to keep misting plants with nutrient solutions.


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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