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。
.完形填空(记叙文)
During the winter of 2002, I had the opportunity to teach tennis in Nevis in the Caribbean Sea. My experience teaching and staying on the island was wonderful, __1__ it was also hard work!
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