Read the following article and select the best answer. Article: Some caterpillars' warning signals may have evolved from walking. A team, writing in the journal Nature Communications, reported that the hair-like structures the creatures use to make sounds evolved from legs. The team studied caterpillars which use these structures to communicate their ownership of leaves. This means the caterpillars are able to "tell" strangers to go away without risking injury in conflicts. "These are really interesting caterpillars," said Dr. Jayne Yack from Carleton University in Ottawa, Canada, who led the research. "They make signals using hair-like structures which are on their back ends." The caterpillars drag these structures across the leaf to make scraping sounds when strangers enter their "leaf shelters". "When they make this signal, the strangers leave," explained Dr. Yack. "It's like saying 'I'm here, get out of here --I already own this leaf'." The scientists looked at other species within the same group of caterpillars and created a "family tree" of the creatures. They used chemical markers to work out the relationship between the animals, showing which in the group were the more ancient species and which species evolved more recently. "Those more ancient species actually don't have these sound-producing structures. They have legs that they use to walk towards strangers," said Dr. Yack. These more ancient species, she explained, walk towards strangers and try to attack them. "They can kill each other in the conflicts," Dr. Yack added. She said that the evolution of the scraping show had allowed the caterpillars to solve their conflicts without fighting. "So our idea is that these signals actually avoid damage to both sides --they solve conflicts in a more 'friendly' way." The study also provides a map of an evolutionary path that many other biologists are exploring. Question: What can we learn about caterpillars' warning structures from the text? - They have the same function as hair. - They are found in caterpillars' heads. - They are used to kill strangers. - They may have evolved from caterpillars' legs.
They may have evolved from caterpillars' legs.

Read the following article and select the best answer. Article: The Internet has got into all the fields of our life. We can study and work on it. We can find a job on it. We can communicate on it. We can treat friends on it. We can buy and sell on it. We can do almost everything on the Internet, and almost anywhere at any time. However, although the Internet provides services for us, it is silently getting our privacy to some degree. The services on most websites require our personal information. If we want to enjoy these services, we have to provide much of our information, including our names, sex, addresses, telephone numbers and sometimes bank accounts. Because weak network sometimes is unsafe, our information might be open, stolen or sold. Even sometimes _ will be used freely by others. Considering the above mentioned, you must pay attention to the safety of your information when using the Internet. First, when you need Internet service, you should always look through those big legal websites. Second, if the service requires important personal information, you should think twice before you type it in. Third, store your own important card key and don't tell others easily. Question: According to the passage, we shouldn't _ when using the Internet. - learn English - give our friends' information to others - chat with friends - look for jobs
give our friends' information to others

Q: Read the following article and select the best answer. Article: Thirteen can be a challenging age. Not only did I have to adapt to my changing body, I also had to deal with my parents' bitter divorce, a new family and the upsetting move from my country home to a crowded town. When we moved, my beloved companion, a small brown pony had to be sold. I was heartbroken and terribly lonely. I couldn't eat or sleep and cried all the time. Finally, realizing how much I missed my pony, my father bought me another horse, Cowboy. Cowboy was without doubt the ugliest horse in the world. But I didn't care. I loved him beyond all reasons. I joined a riding club. When Cowboy and I entered the events where the horse was judged by appearance, we were quickly "shown the gate". I knew nothing could turn Cowboy into a beauty. My only chance to compete would be in the timed speed events. I chose the jumping race. For the whole next month we practiced running and jumping for hours in the hot sun and then I would walk Cowboy home, totally exhausted. All of our hard work didn't make me feel confident by the time the show came. One girl named Becky rode a big brown horse in the race events. She always won the blue ribbons. I sat at the gate and sweated all out while I watched Becky and her horse charge through the court and finish in first place. My turn finally came. At the signal, we dashed toward the first fence, jumped over it without trouble and raced on to the next one. Cowboy then flew over the second, third and fourth fences like a bird and I turned him toward the finish line. No cheers filled the air. The end of our run was met with surprised silence. Cowboy and I had beaten Becky and her fancy horse by two seconds. I gained much more than a blue ribbon that day. At thirteen, I realized that no matter what the odds, I'd always come out a winner if I wanted something badly enough to work for it. I can be the owner of my fate. Question: It can be inferred from the story that _ . - all of their hard training was totally in vain - a blue ribbon must be the second highest prize - Cowboy lost in the event of being judged by appearance - both Becky and the author won in the jumping event
A: Cowboy lost in the event of being judged by appearance

(Q).
Read the following article and select the best answer. Article: Jenny found her old bicycle at the back of the garage.It was a lot smaller than she remembered.When she sat on it and put her feet on the pedals,her knees nearly touched her chin. She then asked her dad for a new bicycle. "Well,I'm sorry,but I can't afford a bicycle now,"said Dad."Why don't you work and earn some money? You can save up for a bicycle yourself." Jenny began to work.That day she earned five dollars for cutting the grass and ten dollars for mowing the lawn for her dad. That night Jenny went on the computer.She wrote"Gardening and Housework--Ten dollars an hour.Call Jenny at 23 Roseville Lane."She decorated the page with pictures of cleaning and gardening equipment.She printed it fifty times.Then she posted the pages through all the doors on her street. That week,Jenny was very busy! Lots of people had jobs to do,but they didn't have time to do them.So they called Jenny.Every day,Jenny rushed home from schoo1.She did her homework quickly,and then she went out to work. At the end of the week.she had$65! She told her father. "That's enough for a second hand bicycle."he said. "Yes,but if I work for one more week,I might have enough money for a new bike,"said Jenny."In two more weeks,I could buy a really good bicycle! I think that's what I'll do. I want to have the best bicycle in the class,because I earn it myself!" Jenny's dad hugged her."I think you learned something important.We appreciate things a lot more when we earn them.When we get something without earning it,we do not realize its true value." Question: Why didn't Jenny's dad buy her a bicycle? - He wanted to teach her a lesson. - He was too busy. - He had just bought Jenny a birthday present. - He didn't think it was a good idea.
(A).
He wanted to teach her a lesson.