B
(2014·河南高三适应性考试)
Brown cows may not actually make chocolate milk, but pink silkworms(蚕) 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(桑树) leaves that had been sprayed(喷洒) with fabric(织物) dyes(染色剂). 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：
【语篇解读】 本文是一篇说明文。你听说过蚕能吐出粉色的丝吗?印度的科学家做了大量的实验，他们通过给蚕喂一些喷过染色剂的桑树叶子，最终成功地使蚕吐出了粉色的丝。
5.A 解析：推理判断题。根据对全文的理解可知，科学家们通过给蚕喂一些喷过染色剂的食物使其吐出粉色的丝。文中介绍了实验过程和实验结论，所以应该是一篇科技报告。故选A。
6.D 解析：细节理解题。根据第一段第二、三句中的“...the team fed ordinary silkworms mulberry(桑树)leaves that had been sprayed(喷洒)with fabric(织物)dyes (染色剂).Out of seven tested dyes，only one worked，producing a thread that reminded me of pinkdyed hair.”可知，科学家用被喷洒织物染色剂的桑树叶子喂养普通的蚕。在七个被测试的染料中，只有一种染料起作用，这种蚕丝，让“我”想起染上粉色的头发。由此推知，蚕之所以会吐出粉色的丝是因为他们被喂了含有染色剂的食物。故选D。
7.B 解析：细节理解题。根据第二段第二句中“...the team，which included engineers and biologists from the CSIRNational Chemical Laboratory in India...”可知，实验是在印度进行的。故选B。
8.A 解析：细节理解题。根据最后一段倒数第二句“Only one dye，named ‘direct acid fast red'，showed up in the final，washed silk threads.”可知，只有一种染料成功了。故选A。
