Six-month-old babies are strictly limited in what they can remember about the objects they see in the world. If you hide several objects from babies, they will only remember one of those objects. But a new study, which was published in an issue of Psychological Science, a journal of the Association for Psychological Science, finds that when babies "forget" about an object, not all is lost. Researchers used to think that babies less than two years old did not understand that an object continues to exist when it is not in the baby's view. But in mid-1980s, new ways of doing experiments with babies found that they do, in fact, know that objects don't disappear when they do not look at them -- a concept known as object permanence. But it was still unknown what babies needed to remember about objects in order to remember their existence. Now Melissa Kibbe, of John Hopkins University, and Alan Leslie, of Rutgers University, are working to figure out exactly what it is that babies remember about objects. For the new study, they showed six-month-old babies two objects, a disk and a triangle. Then they hid the objects behind small screens, first one shape, then the other. Earlier research has shown that young babies can remember what was hidden most recently, but have more trouble remembering the first object that was hidden. Once the shapes were hidden, they lifted the screen in front of the first object. Sometimes they showed babies the shape that was hidden there originally , but sometimes it was the other shape, and sometimes the object had _ completely. Psychologists measure how long babies look at something to see how surprised they are. In Kibbe and Leslie's study, babies weren't particularly surprised to see that screen had changed, for example, from a triangle to a disk. But if the object was gone altogether, the babies looked significantly longer, indicating surprise at an unexpected outcome: "This shows that even though babies don't remember the shape of the object, they know that it should continue to... The study is beneficial to know _ . A) how the young brain deals with information about objects B) whether babies can remember features of hidden objects C) whether babies were surprised when they found the objects disappeared D) why babies less than two years did not understand a hidden object still existed
A

The Celerifere, an early version of the bicycle, was built around 1791 by a French man, Comte Mede de Sivrac. It was basically a scooter with a high seat. There were no pedals---you had to push with your feet like you do with a skateboard or a scooter. Around 1816 Baron Karl Drais de Sauerbrun in Germany added a moveable steering handle. These early machines were often known as dandy horses or hobby horses, but weren't very popular. The improvement that made them popular was added by a Scottish blacksmith around 1839. Kirkpatrick Macmillan added pedals to enable it to get up hills. It was this improvement that made the bicycle a serious form of transportation. Bike were called velocipedes or bone-shakers, because of the lack of the proper tires made for a rough ride! It wasn't until around 1869 that they began to be called bicycles ("two-wheels"). Carriage makers in Paris (either Pierre and Ernest Michaux, or their employee Pierre Lallement) switched the pedal to the front wheel. That's why it is usually either Lallement or the Michauxs, not Macmillan, who are considered as the inventor of the bicycle. In 1869 the penny-farthing or high-wheeler was invented. With the large wheel the rider could go much farther with each push of the pedal, but caused many accidents because the seat was so far off the ground. In the mid-1880s Englishman James Starley manufactured what he called the "safety bicycle" , which had two similarly-sized wheels and a major improvement--- a chain and sprocket driven rear wheel, with the pedals between the two wheels like modern bicycles. One more historical note---it's possible that the idea of the bicycle was thought of almost 400 years before it was actually invented. There is a drawing of a bicycle-like machine in one of Leonardo da Vinci's notebooks, which dates back to about 1493. Why was the bicycle not popular in the early 1800's? A) It was too expensive. B) The seat was too high. C) There were no pedals. D) It had no tires.
C

The most frequent reason why people don't make any money blogging is quite obvious: They do not work enough for it. Lots of people tend to think they just have to put some content online, fill it with Adsense ads and wait until they make money. Seriously, if it were that easy, everyone will have at least one website. Blogging is a job, and often a full- time job. If you want to make money online, you'll have to work with passion. This is unfair, but true. When a website is young (i. e. less than one year old), it is harder to rank high on search engines and to get people's attention. If you own a young website and work a lot, don't worry. Money will come later. Some people work a lot and with passion, but their blog posts suck . When you're a beginner, it is normal to make some mistakes. But if your blog exists since about one year, if you work a lot but do not see good effect, you'll have to improve your skills. In order to write better blog posts, pick the leader blog and study how it succeeds, how many posts the author writes per week, how the author improves the blog, etc. Blogging is one thing, and blog benefit is another. You can be a very good writer with had marketing skills. In that case, do not expect to make a lot of money with your blog, even if you have the _ I recommend you to read this article if you'd like to improve your blog benefit skills. What's the best title for the passage? A) Reasons Why You're Making Money BIogging B) Reasons Why You're Not Making Money Blogging C) Skills That You Can Depend on to Improve Your Blogs D) It's Easy to Make Money by Writing Blogs
B