Article: We have seen that humor and laughter positively influence our body in many ways, but little research has been done on whether a better sense of humor actually helps keep you from getting sick. However, since people with a better sense of humor have higher IgA levels, and since research has shown that those with higher levels of salivary IgA are less likely to get colds or be infected with Streptococcus, humor should reduce the frequency of colds. The only study to directly examine this question found that the impact of one's sense of humor upon colds depends on the kind of sense of humor you have. It was only individuals whose sense of humor took the form of seeking out and appreciating humor who had fewer and less severe colds/flu than their low humor counterparts. Surprisingly, those whose sense of humor took the form of initiating humor more often did not have fewer or less severe colds/flu. The researchers argued that being a person who likes to tell jokes or otherwise initiate humor takes them into more frequent contact with other people, which serves to expose them to infectious agents more often, robbing them of the advantage that a more active sense of humor otherwise offers. Obviously, more research is required to clear up this confusing picture. The importance of active use of one's sense of humor in producing humor's health benefits was confirmed in another study in an unusual way. It found that among a group of mothers with newborn infants, those who actively used humor to cope with the stress in their lives had fewer upper respiratory infections and their infants also had fewer infections. This seemed to be because these mothers had higher levels of immunoglobulin A (A) in their breast milk. Among adults, if we look at bodily symptoms alone, independent of any diagnosed illness, there is some evidence that individuals who have more negative reactions to humor report more bodily symptoms and complaints. Students complaining of cardiovascular symptoms and gastroenterological symptoms also have... Question: According to the passage, IgA is _ . Yes or no, is the answer "enzyme"?
Yes

Article: Geniuses amaze us,impress us and make us all a little jealous. How do they differ from the average person?Scientists are working hard to figure out that answer. Tune in to the National Geographic Channel to find out about the discoveries they're making in the series My Brilliant Brain. When Marc Yu was only two years old,he began to play the piano. After a year, he started learning pieces by Beethoven. Now he's a world-famous concert pianist at age eight. He learns newer and more difficult pieces with ease and can identify any note he hears. He seems to be specially designed for music. In Born Genius, National Geographic looks at the science behind child prodigies to explain why some children seem to be born without limits. _ His came only after he nearly died from bleeding in his brain. After recovering, McHugh's head was filled with new thoughts and picture. So, he began to express them in the form of poetry and art. Now, he's a seemingly unstoppable creative machine. Suffers of brain injury have shown that great mental ability can sometimes come from damage or disease. Accidental Genius explores this puzzling relationship. Can normal people be trained to be geniuses? Susan Polger has shown no sign of extraordinary intelligence. Yet, during her childhood, she studied thousands of chess patterns and learned to recognize them immediately. As a result, she was able to beat skilled adult players by age 10 and can now play up to five games at the same time without even seeing the boards. Make Me a Genius examines what is takes to turn an ordinary brain into that of a genius. If becoming a genius were easy, we'd all be done. Yet, there is much more to super intelligence than simply being born lucky. Learn more about amazing brains this month on National Geographic's My Brilliant Brain. Question: The passage may come from _ . Yes or no, is the answer "a TV program"?
Yes

Q: Article: Special trees that grow faster, fight pollution, produce better wood, and even sense chemical attacks are being planted by scientists in the US. When 40 per cent of Hawaii's US$14 million-a-year papaya industry was destroyed by a virus five years ago, work began on creating genetically engineered trees. Researchers successfully introduced seeds that were designed to resist the virus.Since then, more and more people have been testing genetically engineered trees.Some researchers put special bacteria into trees to help them grow faster and produce better wood.Others are trying to create trees that can clean polluted soil.Meanwhile fruit farmers are looking for trees that are strong enough to resist worms, and paper companies want trees that produce more wood and therefore more paper. The Pentagon even gave the researchers US$500,000 this year after they developed a pine tree that changes its colours if it senses a chemical attack.So far, the poplar, eucalyptus , apple and coffee trees are among those being engineered.All this can be done today because we have a better understanding of tree genomes . However, some people fear that the genetically engineered trees will cause dangerous results.They are worried that the new trees will breed with natural species and change the balance of the forest environment. "It could be destructive," said Jim Diamond, an environmentalist. "Trees are what is left of our natural environment and home to many endangered species." But researchers insist that science could give nature a fighting chance against both natural and man-made dangers.They hope to answer the critics by stopping the new trees from breeding, so their effect on the environment can be controlled. Question: What caused the American scientists to work on special trees? Yes or no, is the answer "Great numbers of trees have been lost due to attacks by viruses."?
A: No

(Q).
Article: A professor I have worked pretty closely with has been diagnosed with Stage 4 cancer. It has been devastating for his family and heartbreaking for his students. What made him extraordinary was not only that he was a rising star. He had only recently collected the highest honors for young researchers at the White House. We truly admire him--as someone put it, 'He always has a smile and a kind word for everyone." It is very hard to find someone who is extremely intelligent should be so nice a human being. I decided that we needed him to know _ and also how we are all praying for his recovery. I bought him a simple card which read, 'Healing thoughts and wishes coming your way." I met all the students he worked closely with and got them to sign on it. Each student in his laboratory signed and also added a message. 'We love you so much", 'We miss you! We need you back here--recover soon"... These were some of the messages that were written. Most of the students were really glad we were doing this and said it was a very good idea to give it to him. He is still undergoing intense treatment, and along with his family is trying his best to stay optimistic and hopeful. I didn't see a trace of self-pity or sadness when I met him last week. Instead, he paid attention to every word of my presentation and asked me several questions related to my work. I was amazed at how much he gave his 100% on that day in spite of being in pain because of chemotherapy( ),he did not know if he even had another month to live. "I am trying to focus on staying positive, hoping to be back this summer," he said. Needless to say, I saw an expression of joy and hope on his face as he opened the card. He said he was truly touched to see the messages from the students he worked closely with. There is one thing I learnt from last week: It is so important to tell people how much they mean to us and what an inspiration they are before it becomes too late. My professor, in spite of being too sick to teach classes, has managed to continue being a... Question: Of the following statements, the writer may agree that _ . Yes or no, is the answer "the professor loves his job very much"?
(A).
No