Question

A new study shows that rising levels of planet-warming gases may reduce important nutrients(营养物质)in food crops

Researchers studied the effects of carbon dioxide on rice. In the experiment， scientists grew 18 kinds of rice in fields in China and Japan.They set carbon dioxide levels to what scientists are predicting for our planet by the end of the century.Rice grown under high carbon dioxide conditions had，on average，13 to 30 percent lower levels of four B vitamins and 10 percent less protein(蛋白质)The crops also had 8 percent less iron and 5 percent less zinc than rice grown under normal conditions. However, vitamin E levels increased by about 13 percent on average.

The researchers said the effects of planet-warming gases would be most severe for the poorest citizens in some of the least developed countries.These people generally eat the most rice and have the least complex diets.That includes about 600 million people in Indonesia， Cambodia，Myanmar，Bangladesh，Laos and other nations，mainly in Southeast Asia.

Other studies have shown that higher temperatures from climate change and weather extremes will reduce food production.But scientists are finding that rising levels of carbon dioxide and other planet-warming gases threaten food quality.

Earlier studies showed that wheat，rice，field peas and soybeans grown under high carbon dioxide conditions all had lower levels of protein and minerals.Scientists predicted that almost 150 million people might be at risk of having too little protein or zinc in their diet by 2050.

The new study suggests a way to lower the nutritional harm of climate change.That is to grow different forms of rice that can adapt to higher carbon dioxide levels.

1.Growing rice under high carbon dioxide conditions may____.

A. increase iron in the rice    B. make it more delicious

C. cause losses of Vitamin E    D. make it less nutritious

2.How can people reduce the nutritional harm of climate change？

A. By importing rice from China and Japan.

B. By taking other kinds of food instead of rice.

C. By avoiding eating rice from Southeast Asia.

D. By growing rice suitable for the environment.

3.What’s the author’s purpose of writing the text？

A. To inform readers what nutrients food crops contain.

B. To call on people to care for the planet they live on.

C. To share the results of some studies on people’s diets.

D. To tell readers where food crops are mainly produced.

4.In which part of a magazine can you read the text？

A. Advertisements.    B. Arts and culture.

C. Science report.    D. Business news.

Answer

1. D

2. D

3. B

4. C

【解析】

本文是一篇说明文，一项新的研究显示在二氧化碳含量高的条件下生长的水稻营养物质比正常情况下生长的水稻少了很多。而且小麦、豌豆、大豆等植物在这种条件下，营养物质也都有不同程度的丢失。提醒人们关爱我们生活的地球。

1.判断推理题。根据第二段“.Rice grown under high carbon dioxide conditions had， on average，13 to 30 percent lower levels of four B vitamins and 10 percent less protein(蛋白质)The crops also had 8 percent less iron and 5 percent less zinc than rice grown under normal conditions.”可知在二氧化碳含量高的条件下生长的水稻营养物质比正常情况下生长的水稻少了很多。故D项正确。

2.细节理解题。根据最后一句“.That is to grow different forms of rice that can adapt to higher carbon dioxide levels.”可知减少气候变化对水稻营养破坏的方法是种植一些能够适应二氧化碳含量较高的气候条件的水稻品种。故D项正确。

3.推理判断题。根据文章第一段和倒数第二段“Earlier studies showed that wheat， rice， field peas and soybeans grown under high carbon dioxide conditions all had lower levels of protein and minerals.”可知水稻、小麦、豌豆、大豆等植物在二氧化碳含量高的条件下，营养物质都有不同程度的丢失。这些对人类生存产生了威胁，本文是为了提醒人们关爱我们生活的地球。故B项正确。

4.判断推理题。本文是一篇说明文，一项新的研究显示在二氧化碳含量高的条件下生长的水稻营养物质比正常情况下生长的水稻少了很多。而且小麦、豌豆、大豆等植物在在二氧化碳含量高的条件下，营养物质都有不同程度的丢失。属于科学研究的范围，与广告、文化艺术及商业新闻无关。故C项正确。