Read the article and select the best answer. Article: Mosquitoes ruin countless American picnics every year, but around the world, this bloodsucking beast isn't just annoying--it causes a health problem. More than a million people die from the spread of mosquito-borne diseases like malaria and yellow fever each year. Attempts to control populations via insecticides like DDT have had ruinous side effects for nature and human health. Neurobiologist Leslie B. Vosshall has a different solution for stopping the insects and the spread of disease. "I believe the key to controlling mosquito behavior is to understand better how they sense us," she says. At their Rockefeller University lab, Vosshall and her colleagues are studying the chemical sensory processes by which mosquitoes choose hosts. How do they sense heat, humidity, carbon dioxide, and body odor ? What makes some people more attractive to a mosquito than others? It takes blood and sweat to find out. To study how mosquitoes assess body odor, Vosshall and her teammates might wear stockings on their arms and keep from showering for 24 hours to create sample smells, _ They insert their arms into the insects' hidden home to study how mosquitoes land, bite, and feed and then they document how this changes. This can mean getting anywhere from one bite to 400, depending on the experiment. Studying male mosquitoes is more pleasant. Since they don't feed on blood, the lab tests their sense of smell using honey. Vosshall and her team have also begun to study how genetics contribute to mosquitoes' choice of a host. She's even created a breed that is unable to sense carbon dioxide, an important trigger for the insects. "By using genetics to make mutant mosquitoes, we can document exactly how and why mosquitoes hunt humans," Vosshall says. Once Vosshall figures out what makes mosquitoes flock to us, she can get to work on making them leave us alone. Many of her lab's proposed solutions sound simple enough, including bracelets that carry long-lasting repellants or traps that can reduce populations, but the breakthroughs,... Question: Vosshall and her colleagues are mainly studying mosquitoes' _ . Options: A: appearance B: size C: behavior D: change
C

Read the article and select the best answer. Article: "I will never marry," the future Elizabeth I declared at the age of eight, and, to the terror of her people, the Great Queen kept her word. For four centuries, historians have guessed why Elizabeth never married.In her own day, her decision to remain single was considered absurd and dangerous.A queen needed a husband to make political decisions for her and to organise and lead her military campaigns.More important, she needed male heirs to avoid a civil war after her death. There was no shortage of suitors for the Queen, both English courtiers and foreign princes, and it was confidently expected for the best part of 30 years that Elizabeth would eventually marry one of them.Indeed, although she insisted that she preferred the single state, she kept these suitors in a state of permanent expectation.This was a deliberate policy on the Queen's part, since by keeping foreign princes in hope, sometimes for a decade, she kept them friendly when they might otherwise have made war on her kingdom. There were, indeed, good political reasons for her avoiding marriage.The disastrous union of her sister Mary I to Philip II of Spain had had an unwelcome foreign influence upon English politics.The English were generally prejudiced against the Queen taking a foreign husband, particularly a Catholic one.Yet if she married an English, jealousy might lead to the separation of the court. There were other, deeper reasons for Elizabeth's unwillingness to marry, chief of which, I believe, was her fear of losing her autonomy as Queen. In the 16th century, a queen was regarded as holding supreme dominion over the state, while a husband was thought to hold supreme dominion over his wife.Elizabeth knew that marriage and motherhood would bring some harm to her power. She once pointed out that marriage seemed too uncertain a state for her. She had seen several unions in her immediate family break down, including that of her own parents. Some writers, based on very fragile evidence, have argued that Elizabeth was frightened or incapable... Question: To the suitors including English courtiers and foreign princes,Elizabeth _ . Options: A: held back the truth B: gave a definite answer "no" C: kept them expecting deliberately D: said she preferred the single state
C

(Q).
Read the article and select the best answer. Article: I was in a rush as always, but this time it was for an important date I just couldn' t be late for! I found myself at a checkout counter behind an elderly woman seemingly in no hurry as she paid for her groceries. A PhD student with not a lot of money, I had hurried into the store to pick up some flowers. I was in a huge rush, thinking of my upcoming evening. I did not want to be late for this date. We were in Boston, a place not always known for small conversation between strangers. The woman stopped unloading her basket and looked up at me. She smiled. It was a nice smile --warm and reassuring -- and I returned her _ by smiling back. "Must be a special lady, whoever it is that will be getting those beautiful flowers," she said. "Yes, she' s special," I said, and then to my embarrassment, the words kept coming out. "It' s only our second date,but somehow I am just having the feeling she's 'the one' ,"Jokingly, I added, "The only problem is that I can' t figure out why she' d want to date a guy like me." "Well, I think she's very lucky to have a boyfriend who brings her such lovely flowers and who is obviously in love with her," the woman said. "My husband used to bring me flowers every week -- even when times were tough and we didn' t have much money. Those were incredible days; he was very romantic and -- of course -- I miss him since he' s passed away." I paid for my flowers as she was gathering up her groceries. There was no doubt in my mind as I walked up to her. I touched her on the shoulder and said, "You were right, you know. These flowers are indeed for a very special lady." I handed her the flowers and thanked her for such a nice conversation. It took her a moment to realize that I was giving her the flowers I had just purchased."You have a wonderful evening," I said. I left her with a big smile and my heart warmed as I saw her smelling the beautiful flowers. I remember being slightly late for my date that night and telling my girlfriend the above story. A couple of years later,when I finally worked... Question: What is the message conveyed in the story? Options: A: Flowers are important for a date. B: Small talk is helpful. C: Love and kindness are rewarding. D: Elderly people deserve respecting.
(A).
C