Q: Read the following article and answer the question. Article: Bats are impressive creatures. They are known to carry dangerous diseases like SARS without getting sick. So researchers wanted to know: How do bats fight off so many deadly diseases? Learning their secret could help doctors better treat humans who have these diseases, therefore saving millions of lives. To solve this problem, a team of researchers from Australia and China analyzed bat DNA. The scientists studied two kinds of bats--the Australian megabat, known as the flying fox, and the Chinese microbat. The scientists then arranged the bat genome in order by comparing their DNA. The researchers now think that the special immunity to illness that bats have may be connected to their ability to fly. Bats are the only mammals that can truly fly. Flying uses up a lot of energy. The energy burned for flying produces something in the animal called free radicals . Free radicals can damage DNA and lead to diseases such as cancer. However, bats are not affected by free radicals produced during flight. The reason is that bats carry special genes to repair any damaged DNA. Scientists think that because bats fly and produce free radicals, they've evolved to carry genes that shaped their special immune system. "We're thinking that the evolution of flight led to a sort of effect, influencing not only the immune system but also things like aging and cancer," says Chris Cowled, of the Australian Animal Health Laboratory. "We think we've really found something special." Researchers believe that this discovery might one day be key to helping humans fight diseases such as cancer that attack the immune system and damage DNA. Question: The passage is mainly about _ . Answer:

OPTIONS:
- bats and dangerous diseases
- bats and their special immune system
- free radicals and immune system
- ways to cure cancer

A: bats and their special immune system

Q: Read the following article and answer the question. Article: I was doing some Christmas shopping in a toy store and decided to look at Barbie dolls for my nieces. A nicely dressed little girl was excitedly looking through the Barbie dolls as well. As she was looking, a little boy came to the Pokemon toys. He was dressed neat-ly, but his clothes were obviously old. He was with his father as well, and kept picking up the Pokemon video toys. Each time he picked one up and looked at his father, his father shook his head and said,"No. " The little girl had chosen her Barbie. However, she stopped and was watching them. Rather dejectedly, the boy had to give up the Pokemon toys and choose something else. The little girl put her Barbie back on the shelf, and ran over to the Pokemon toys. She excitedly picked up one and raced towards the checkout. I picked up my purchases and got in line behind them. Then, much to the little girl's delight, the little boy and his father got in line behind me. After the toy was paid for and bagged, the little girl handed it back to the cashier and whispered something in her ear. The cas her smiled and put the package under the counter. I paid for my purchases and was rearranging things when the little boy came up to the cashier. The cashier checked his purchases and said," Congratulations, you are my hundredth customer today, and you win a prize !" With that, she handed the little boy the Pokemon toys, and he could only stare in surprise. It was exactly what he had wanted ! The little girl and her father had been standing at the doorway during all of this. Then they walked out. As I walked back to my car, I heard the father ask his daughter why she had done that. I'll never forget what she said to him. "Daddy, didn't grandparents want me to buy something that would make me happy?" He said,"Of course they did, honey. " To which the little girl replied," Well, I just did !" I feel very shocked to have witnessed the true spirit of Christmas in that toy store, in the form of a little girl who understands more about the meaning of this festival than... Question: How did the little boy get the Pokemon toys? Answer:

OPTIONS:
- His father bought him the Poknemon toys.
- Fortunately, he was the hundredth customer and won the Poknemon toys.
- The cashier felt sympathy for the little boy and gave him the Poknemon toys.
- The little girl bought the Poknemon toys for him.

A: The little girl bought the Poknemon toys for him.

Q: Read the following article and answer the question. Article: They say money doesn't grow on trees. But it certainly appears to do so on the mysterious coin-studded trunks dotted around the UK's woodland. The strange phenomenon of old trees with coins fixed firmly all over their bark has been spotted on trails from the Peak District to the Scottish Highlands. The coins are usually knocked into felled tree trunks using stones by passers-by, who hope it will bring them good fortune. These fascinating spectacles often have coins from centuries ago buried deep in their bark and warped by the passage of time. The tradition of making offerings to gods at wishing trees dates back hundreds of years, but _ . It used to be believed that god's spirits lived in trees, and they were often decorated with sweets and gifts -- as is still done today at Christmas. The act is like tossing money into ponds for good luck, or the trend for couples to attach "love padlocks" to bridges and fences to symbolize lasting romance. Some pubs, such as the Punch Bowl in Askham, Cumbria, have old timbers with splits in them into which coins are forced for luck. There are seven felled tree trunks with coins pushed into them in the picturesque village of Portmeirion, in Wales. Meurig Jones, an estate manager at the tourist destination, told the BBC, "We had no idea why it was being done when we first noticed the tree trunk was being filled with coins. I did some detective work and discovered that trees were sometimes used as 'wishing trees'. In Britain it dates back to the 1700s -- there is one tree somewhere in Scotland which apparently has an old coin stuck into it. " He said that a sick person could press a coin into a tree and their illness would go away. If someone then takes the coin out though, it's said they then become ill. We haven't made it known at all, it's just happened," he added. "It's quite amazing really." In Scotland, there is also a legend about a kissing tree. If a young man could drive a nail into a tree with one blow, he earned a kiss from his sweetheart. Question: What was the real reason why in UK people knocked coins into the old trees? Answer:

OPTIONS:
- It was hoped that it would bring them good future and make the trees more beautiful.
- Nobody knew why there was such a strange custom that it could make them lucky.
- It might come from the tradition of making offerings to gods hundreds of years ago.
- It was said that god's spirits lived in trees and doing so could please the gods of the trees.

A:
It might come from the tradition of making offerings to gods hundreds of years ago.