I'm taking a test and have to guess the right answer to the question after the article. Article: Back in the 1860s, a British scientist named Henry Walter Bates noticed something interesting in the animal world: a kind of butterfly, Common Mormon, can change the pattern on its wings so that it looks like another butterfly species, the Common Rose, which is poisonous for birds to eat. Bates argued that animals develop this ability to protect themselves from being eaten. This theory had been widely accepted by scientists. But one question remains: how do these animals manage to do that? After more than 150 years, scientists are finally able to answer that question--it is all down to a gene called "doublesex", according to a study published on March 6 in the journalNature. In fact, scientists have long known that genes are responsible for this useful ability. But until the new study, scientists hadn't been able to find out which genes in particular were responsible. Scientists at the University of Chicago compared the genetic structures of the Common Mormons that changed their wing patterns with those of ones that did not. And all the results pointed to a single gene, "doublesex". This was much to the scientists' surprise. They used to expect that something as complex as this would be controlled by many different genes. For example, one gene would control the color of the upper part of the wing, one would do so for the lower part. However, the "doublesex" gene doesn't quite do everything by itself. Instead, it acts like a switch--it "tells" other genes to change the wing patterns. Isn't that clever? Scientists believe that this special ability of the "doublesex" gene on Common Mormon was developed throughout the long history of evolution. "The harmless species gains an advantage by resembling something predators avoid," Sean Carroll, a scientist toldNature. "it was obvious evidence for natural selection. " Question: What is the best title of this passage? Options: A: How Common Mormons stay safe B: How butterflies changed wings' pattern C: What American scientists discovered D: What genetic structures of butterflies have
A

I'm taking a test and have to guess the right answer to the question after the article. Article: To master a language one must be able to speak and understand the spoken language as well as to read and write.Lenin and his wife translated a long English book into Russian but when they went to England in 1902, English people couldn't understand a word Lenin and his wife said, and Lenin and his wife couldn't understand what was said to them.This shows the importance of spoken language. Speaking, of course can't go without listening.If you want to pronounce a word correctly, first you must hear it correctly.The sounds of Chinese and English languages are not exactly the same.If you don't listen carefully, you'll find it difficult or even impossible to understand the native speakers. Well, what about writing? Like speaking, it's to exchange ideas.People usually use shorter words and shorter sentences in their writing. The important thing is to make your idea clear in your mind and then to write it in a clear lively language. Chinese students read too slowly.If you read fast, you understand better.If you read too slowly by the time you have reached to the end of a page you have forgotten what the beginning is about.When you meet with new words don't look them up in the dictionary.Guess the meaning to form the context. You may not guess quite correctly the first time but as new words appear again and again in different context their meaning will become clearer and clearer. If you look up every word you'll never finish a book. Students of a foreign language need a particular knowledge, the knowledge of the life, history and geography of the people whose language they're studying. They should study those subjects in the foreign language not only in translation.In this way one can kill two birds with one stone: learn a foreign language and get some knowledge of the foreign country at the same time. Question: In England Lenin _ . Options: A: could be understood by Englishmen B: could understand Englishmen C: and Englishmen couldn't understand each other D: and Englishmen could understand each other
C

I'm taking a test and have to guess the right answer to the question after the article. Article: Millions of people die of hunger in Southern Africa every year, but when prefix = st1 /Zambiawas offered thousands of tons of free maize by theUS, the government politely said no. "We don't know whether the food is safe," said Zambia's Commerce, Trade and Industry Minister Dipak Patel. His worries are shared by countries around the world that are _ aboutAmerica's genetically modified (GM) crops. Just last week, EU member nations were discussing whether or not to import GM sweet corn from theUS. Ever since people started farming, they have tried to crossbreed plants to make them stronger or better tasting. At one time, only related plants could be crossed with each other. But when GM techniques were developed in the 1970s, scientists were able to put a single gene from a living creature into an unrelated creature. This means they can make crops more productive and resistant to disease by adding genes from other species. They can also create food with special characteristics, such as "golden rice", which is enriched with vitamin A. But many people believe GM foods are a health risk. "If left to me, I would certainly not eat GM foods," said Scottish scientist Arpad Pusztai. "We are putting new things into food which haven't been eaten before. The effects on the immune system are not easy to predict." At the moment, the official argument is that GM foods "are not likely to present risks for human health". But there are still many questions to be answered as the foods are produced in different ways. Some experts believe the genetic material added to plants can transfer to humans and give damage to our bodies. Further harm could be caused by the genes from GM plants crossbreeding with naturally produced crops. Question: What's the author's attitude? Options: A: Supportive. B: Neutral. C: Doubtful. D: Critical.
B