Read the following article and select the best answer. Article: Green invaders are taking over America. Not invaders from space, but plants! You might not think of plants as dangerous, but in this case they are threatening nature's delicate food chain. The invaders are plants brought here from other countries to make gardens and yards look pretty. Ever since people started to arrive on America's shores, they have carried along trees, flowers, and vegetables from other places. Now there are so many of those plants, they are crowding out the native plants that have lived here since before human settlers arrived. And that's a problem, says Dr. Doug Tallamy. He's insect expert at the University of Delaware. He explains that almost all the plant-eating insects in the United States are specialized, which means they eat only certain plants. Monarch butterfly caterpillars ,for example, dine on milkweed. If people cut down milkweed and replace it with another plant, the butterflies will not have the food source that they need to survive. But the trouble doesn't stop there. When insects can't get the right plants to eat and they die off, then the birds don't have enough bugs for their meals. Tallamy points out that almost all migrating birds depend on insets to feed their young. "We cannot let the plants and animals around us disappear." says Tallamy, "The way to preserve them is to give them food to eat. But when we plant non-native plants, we are _ the food chain, because then we don't have the insects the birds need to live." Fewer of the right plants mean fewer bugs, and fewer bugs mean fewer birds. And that's bad for the Earth, because we need a variety of living things to keep the planet healthy and beautiful. The good news is, garden centers sell native plants. "Just Google 'native plants' and your location, and you can find out which plants really belong where you live," says Tallamy Question: How did green invades arrive at America? - They fell down from space. - They floated to the America's shores. - They were brought in from foreign countries - They has lived here since human settlers arrived
They were brought in from foreign countries

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Read the following article and select the best answer. Article: Is war unavoidable? Can war be prevented? History tells that there were wars, great or small, in every century, in every decade. Throughout the ages, from the Stone age to the Atomic Age, men have been fighting, first with swords and shields , then with guns and cannons, and now, hydrogen bombs and missiles are used for military purpose. But, in spite of all these, it is still my belief that war can be prevented and peace can be won, but it requires the effort of every one of us. I am sure that we would not like to experience another world war. If it ever happens, two-thirds of the world and much of the civilization which men have gained through time, patience and effort will be destroyed. Will then the remaining one-third of the world be able to survive on its own? Our task now is not to blame the past, but to plan for the future. If there is peace in the world, men can use their rockets to explore the mystery of space, their submarines to explore the depth of the sea, their missiles to deliver mails and their fine equipment to penetrate the jungles of Africa, instead of using them military. Governments can use their money to build more schools, so that more children can be educated to be useful citizens. Scientists can use atomic energy to propel steamships and planes. They can also design new machines to increase the production of goods and thus improve the way of living of the people. How can a peaceful world be achieved? It requires, in my opinion, the understanding and friendship between all people from all nations. Let no one suffer discrimination by reason of color, race, religion, or national origin. Let the rich support the poor and the strong help the weak. We know that neither peace nor such a dream world can come true in a day or a month. It may even take decades or centuries. But let us plan and begin now. Question: We can infer from the passage that _ . - wars were not expensive in the past - wars can promote the development of weapons - things for military use can be transformed to peaceful use - as long as there are wars, people's way of living cannot be improved
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things for military use can be transformed to peaceful use

Question: Read the following article and select the best answer. Article: Scott Langteau has this message for kids:spend less time playing video games. It's a message that many a mom and dad have tried to impress upon many a youngster (and some notsoyoungsters) who spend perhaps a bit too much time with game controllers in hand. But the 40yearold Langteau isn't a parent.He's a veteran of the video game industry--one who played producer on three "Medal of Honor" games and cofounded his own game development company. Langteau has just published a children's books called Sofa Boy,which tells the story of a kid who spends too much time sitting on the couch with controller clutched in hand and the rather terrible consequences that follow. It's a fairy tale plucked straight from Langteau's own experiences as a lad with a fondness for video games and his own bouts with a bit of game addiction.But first,Langteau would like to make one thing clear,"I'm not saying that you shouldn't play video games.I think video games are great.I think they do great things for kids."Instead,Langteau says his book is all about a little something called moderation . "It's about being well rounded," he says."Just like with anything else,we all need to make sure that there's a variety in what we do." Video gamers can be rather badtempered when it comes to accepting criticism about their favorite entertainment.And understandably so.After all,most people who go around talking about the dangers of playing video games tend to be outsiders--people who don't play video games and certainly don't understand that they can be a valuable and healthy form of entertainment. But Langteau and Sofa Boy seem to be in a unique position to deliver a message of gaming moderation that the young game masses might actually listen to.After all,this is a man who understands what it means to be a kid with a passion for games.His early experience has taught him a lesson. Question: Scott Langteau published Sofa Boy to _ . - share his great skills on games - warn kids against game addiction - tell about his fairy tale as a kid - deliver a message for video games
Answer:
warn kids against game addiction