Ques: Below is a selection from a popular science book. If blood is red, why are veins  blue? Actually, veins are not blue at all. They are more of a clear, yellowish colour. Although blood looks red when it's outside the body, when it's sitting in a vein near the surface of the skin, it's more of a dark reddish purple colour. At the right depth, these blood-filled veins reflect less red light than the surrounding skin, making them look blue by comparison. Which works harder, your heart or your brain? This question depends on whether you're busy thinking or busy exercising. Your heart works up to three times harder during exercise, and shifts enough blood over a lifetime to fill a supertanker. But, in the long run, your brain probably tips it, because even when you're sitting still your brain is using twice as much energy as your heart, and it takes four to five times as much blood to feed it. Do old people shrink as they age? Yes and no. Many people do get shorter as they age. But, when they do, it isn't because they're shrinking all over. They simply lose height as their spine  becomes shorter and more curved due to disuse and the effects of gravity . Many (but not all) men and women do lose height as they get older. Men lose an average of 3-4 cm in height as they age, while women may lose 5 cm or more. If you live to be 200 years old, would you keep shrinking till you were, like 60 cm tall, like a little boy again?No, because old people don't really shrink!It is not that they are growing backwards--their legs, arms and backbones getting shorter. When they do get shorter, it's because the spine has shortened a little. Or, more often, become more bent and curved. Why does spinning make you dizzy ? Because your brain gets confused between what you're seeing and what you're feeling. The brain senses that you're spinning using special gravity and motion sensing organs in your inner ear, which work together with your eyes to keep your vision and balance stable. But when you suddenly stop spinning , the system goes out... Which of the following statements about our brain is TRUE? A) In the long run, our brain probably works harder than our heart. B) When our brain senses the spinning, we will feel dizzy. C) The brains of the other mammals are as complex as those of humans. D) Our feelings and emotions come from the most developed area in our brain.
Ans: A

Ques: Of all the websites,one that has attracted attention recently is  _ .Most of this attention has come from the media and tells every reason why the website should be shut down.The threat of internet predators is indeed a tough reality,but shutting down the site is not the answer.If  _ were shut down,another site would quickly take its place.Therefore,the right way is to teach teens how to use the site safely and educate them about who may be predators and how to avoid them. The key to staying safe on the Internet is to make sure that your profile is secure.The simplest way is to change the privacy setting on your profile to "private", which protects your information so that only the people on your friend list can view it.Although this is effective,it is not perfect.Predators can find ways to view your profile if they really want to,whether through hacking in or figuring out their way onto your friend list.Thus,you should never post too much personal information.Some people actually post their home and school addresses,date of birth,and other personal information, often letting predators know exactly where they will be and when.The most information that is safe is your first name and province.Anything more is basically inviting a predator into your life. Another big issue is photos. I suggest completely skipping photos and never posting a photo of a friend online without asking permission. Most importantly, never,under any circumstances,agree to a real-life meeting with anyone you meet online.No matter how well you think you know this person, there are no guarantees that they have told the truth.But you could feel free to chat with people you meet on the site, but just remember that not everyone is who they say they are.Hopefully,the next time you edit your profile,you'll be more informed about the dangers of internet predators and take the steps to defend yourself. Kids can avoid web predators successfully by_. A) attracting more public attention B) shutting down the website "myspace . com" C) showing the kids ways to try other sites D) recognizing and getting away from them
Ans: D

Ques: High school could be a scary time for everyone. The school seems bigger; there are more kids and it's a totally new environment. In fact, it isn't that bad. High school is a lot like middle school after a while. The first day of course is always scary, and the first day of middle school must have been the same. Of course, the first few days you might get lost while looking for your classes but after a while, what seemed to be a large school really isn't. One thing that's really cool about high school is that there are so many more classes you can take. If you happen to like art, there are many art classes. In addition, there are other classes that weren't available in middle school like photography or psychology. In high school, there are a lot of things that are similar to how middle school was but at the same time, there are other opportunities available as well. There are more clubs, sports, and other activities you can join in. You're able to join in these activities and make new friends with kids with the same interest as you. These activities also give you a chance to learn something you never had the opportunity to learn before. High school has something for everyone. You just have to decide what to take part in. but there's one thing that's certain that you're going to have just as much fun in high school as you did in middle school. And if middle school wasn't that great for you, high school is a chance to make up for it. High school isn't just about having fun though. You have to be responsible while you're growing up. Teachers aren't going to chase   you up to do your homework. In the author's opinion, high school life   _  . A) is a scary time for everyone B) is full of fun without any worries C) is the same as middle school life D) is as much fun as middle school life
Ans:
D