B

　　(2014·河南高三適應性考試)

　　Brown cows may not actually make chocolate milk, but pink silkworms(蠶) do produce pink silk, a team of scientists has discovered. To see if they could produce predyed silk—silk that comes colored, straight from the source—the team fed ordinary silkworms mulberry(桑樹) leaves that had been sprayed(噴灑) with fabric(織物) dyes(染色劑). Out of seven tested dyes, only one worked, producing a thread that reminded me of pink­dyed hair.

　　And yes, the worms themselves take on some color before they produce silk. Their colorful diets did not affect their growth, the team, which included engineers and biologists from the CSIR­National Chemical Laboratory in India, reports in the journal ACS Sustainable Chemistry & Engineering. (The researchers didn't look too deeply into how the dyes affected the silkworms' health. After all, silkworms die when people harvest their silk.)

　　The team made dyeing silk this way because coloring fabric normally uses large amounts of fresh water. The water gets polluted with dangerous chemicals in the process, requiring costly treatment before factories can send it back into waterways. Dyeing silk directly by feeding silkworms would avoid those water­washing steps. Scientists are just starting to study this idea. However, it remains to be seen if it's commercially successful. In this experiment, the Indian team tested seven dyes, which are cheap and popular in the industry.

　　The scientists found different dyes moved through silkworms' bodies differently. Some never made it into the worms' silk at all. Others colored the worms and their silk, but the color disappears before the silk is turned into fabric. Only one dye, named “direct acid fast red”， showed up in the final, washed silk threads. By the time it made it there, it was a pleasant, light pink.

　　5. The text is most probably a(n) ________.

　　A.science report

　　B.tourist guide

　　C.animal experiment

　　D.fashion advertisement

　　6. Silkworms can produce pink silk because ________.

　　A.they are born pink

　　B.they are dyed pink

　　C.they grow in pink water

　　D.they are fed dyed food

　　7. Where is the experiment carried out?

　　A.In America. B.In India.

　　C.In Israel. D.In China.

　　8. How many dyes have been proved successful in the experiment?

　　A.One. B.Three.

　　C.Five. D.Seven.

　　答案：

　　【語篇解讀】　本文是一篇說明文。你聽說過蠶能吐出粉色的絲嗎?印度的科學家做了大量的實驗，他們通過給蠶喂一些噴過染色劑的桑樹葉子，最終成功地使蠶吐出了粉色的絲。

　　5.A　解析：推理判斷題。根據(jù)對全文的理解可知，科學家們通過給蠶喂一些噴過染色劑的食物使其吐出粉色的絲。文中介紹了實驗過程和實驗結(jié)論，所以應該是一篇科技報告。故選A。

　　6.D　解析：細節(jié)理解題。根據(jù)第一段第二、三句中的“...the team fed ordinary silkworms mulberry(桑樹)leaves that had been sprayed(噴灑)with fabric(織物)dyes (染色劑).Out of seven tested dyes，only one worked，producing a thread that reminded me of pink­dyed hair.”可知，科學家用被噴灑織物染色劑的桑樹葉子喂養(yǎng)普通的蠶。在七個被測試的染料中，只有一種染料起作用，這種蠶絲，讓“我”想起染上粉色的頭發(fā)。由此推知，蠶之所以會吐出粉色的絲是因為他們被喂了含有染色劑的食物。故選D。

　　7.B　解析：細節(jié)理解題。根據(jù)第二段第二句中“...the team，which included engineers and biologists from the CSIR­National Chemical Laboratory in India...”可知，實驗是在印度進行的。故選B。

　　8.A　解析：細節(jié)理解題。根據(jù)最后一段倒數(shù)第二句“Only one dye，named ‘direct acid fast red'，showed up in the final，washed silk threads.”可知，只有一種染料成功了。故選A。