Not long ago, the only time you could see a robot was when you were reading a novel or watching a movie such asStar Wars . Today, however, a lot of things in science stories have been science facts. Robots are starting to appear in our everyday lives. These robots have different sizes, shapes, and colors. But they all have the same type of man-made "brain". Leading the robot revolution are industrial robots that work in factories. Industrial robots can do different kinds of jobs that are often boring and sometimes dangerous. Robots are also coming to American homes, though not as quickly as they are entering factories. These robots aren't as friendly and bright as those you saw in Star Wars.But, their makers say, today's home robots "walk", sense objects in their way (and sometimes knock into them), and even carry objects (which they sometimes drop). Well, nobody is perfect. We may laugh at home robot today, but some day they may see and hear better than humans do. We humans can only see certain wavelengths of light, and hear certain sounds. That's because the abilities of our eyes and ears are limited. Robots, however, need not have the same limits as we have. Robot may also be equipped with devices that pick up information humans can't. To understand what their sensing devices pick up is a hard job. Remember, man--made brains handle information, including all kinds of data, as zeroes and ones. Imagine the difficulty in trying to explain to a robot what a football looks like--using only zeroes and ones. The development of robots suggests that _ . A) science and technology are developing fast B) people are interested in new inventions C) machines are more capable than humans D) robots can be very interesting
A

Want to save the environment? You probably can't fix everything on your own, but by taking small steps and keeping the environment in mind every day, you can make a difference, 1. Think Green. Challenge yourself to think about the environment as you live your life. If you shut off lights when you leave the room, turn off your TV when you're not watching it, you'll save energy. If you take shorter showers, you'll save water. 2. Shop Green. Shopping is fun, but buying things you don't need is wasteful and bad for the earth. Before you buy something, ask yourself how much you'll really use it. Keep yourself away from buying products with unnecessary packaging , and whenever possible, buy things that were locally made instead of those shipped from far away. 3. Dress Green. Wear green trousers and T-shirts if you want. But what really matters isn't the colour, it's how the clothes were made. If you want to help the environment, the best place to find clothes is at _ , but you might not want to buy everything used. No matter where you shop, keep an eye out for products made from environmentally friendly materials like organic cotton, which is grown without the use of pesticides ( ). 4. Study Green. What's better than learning about the environment? Save it while you learn, It can be as simple as using both sides of a piece of paper before you recycle it, or reusing an old textbook :instead of buying a new one. If you want to do more, join an environmental group at your school, and encourage your friends to join, too. What does the passage mainly talk about? A) Some Methods to Live Happily. B) Some Advice to Save Money in Daily Life. C) Some Steps to Live a Healthy Life. D) Some Ways to Make One's Life Green.
D

How many things can you see in the night sky? A lot! On a clear night you can see the moon, some planets, and thousands of sparking stars. You can see even more with a telescope. You might see that many stars look larger than others. You might see that some stars that look white are really red or blue. With bigger and bigger telescopes you can see more and more objects in the sky. And you can see those objects in more and more detail. But scientists believe there are some things in the sky that we will never see. We won't see them with the biggest telescope in the world, on the clearest night of the year.That's because they're _ . They're the mysterious dead stars called black holes. You might find it hard to imagine that stars die. After all, our sun is a star. Year after year we see it up in the sky, burning brightly and giving us heat and light. The Sun certainly doesn't seem to be getting old or weak. But stars do burn out and die after billions of years. As a star's gases burn, they give off light and heat. But when the gases run out, the star stops burning and begins to die. So next time you look up at the night sky, remember: there's more in the sky than we can see! How can we see even more in the sky? A) By using a telescope B) By using a microscope C) By climbing up to the top of a mountain D) By going outside on a clear night.
A