Read the following article and select the best answer. Article: The League of High Schools is pleased to invite student freethinkers to our 2007 Student Leadership Meeting July 15 -17 at our office building in Manhattan, New York. This yearly meeting has been successfully held for the past three years. The event brings together student activists from around North America for a busy weekend of workshops, networking, lectures, and a lot of fun. We encourage every school to send at least one representative (if not more) and we are keeping the costs down to help make this possible. Any individual * student activists who are interested are also welcome to attend. Registration ,rd5m and food for the entire three day event will cost only $ 39 for each student. We' ve booked you single rooms at Travelodge, New York. For any information about the hotel, please call 88643911. This time we are making a special offer providing some money for travelling to make sure each group can send a representative even if it lacks the money to do so. Email Anna Porter at apor- ter@ leaguehighschool. net or call 46935040 to get more information about this travel support. The registration form can be found at http://www. freethought. org/SLM2007. pdf. For more information about registration you may call Lucy Becker at 36904560 or email her at lbecker @ IeaguehighschooL net. So don't wait! Send in your registration.' Question: The main purpose of this passage is to _ . - explain meeting programs - invite students to a meeting - call for papers for a meeting - introduce meeting organizers
invite students to a meeting

Read the following article and select the best answer. Article: In the frozen continent of Antarctica scientists fear an alien invasion -- not from outer space, but carried in people's pockets and bags. Seeds and plants accidentally brought to Antarctica by tourists and scientists may introduce alien plant species which could threaten the survival of native plants in the finely balanced ecosystem. "The people that were carrying the most had lots and lots of seeds. They really were real threats," said Dana Bergstrom, from the Australian Antarctic Division. "When we take things in through hitchhiking then we get species which are competitive. The plants and animals there are not necessarily competitive, so we'd start losing various precious biodiversity on the (Antarctic) continent", Bergstrom told Reuters. Amongst the alien species discovered were the Iceland Poppy, and Annual Winter Grass -- all from cold climates and capable of growing in Antarctica. The Antarctic Peninsula, where most tourists travel, is now considered a "hot spot" on the frozen continent and the warmer the climate, the easier for seeds to grow. "The peninsula is warming at some of the greatest rates on the planet," said Bergstrom. The study, the first continent-wide assessment of invasive species in Antarctica, surveyed about 1,000 passengers during 2007-2008, the first year of the International Polar Year, an international effort to research the polar areas. Bergstrom said the one alien seed that had gained a foothold is Annual Winter Grass. It is a strong weed in the sub-Antarctic and is on the Antarctic island of King George. It has also made its way to the tail part of the Antarctic continent. Question: What is the effect of alien plant seeds to Antarctica? - They contribute to the biodiversity. - They lead to the warming up of Antarctica. - They make the native plants more competitive. - They break the balance of the natural environment of plants.
They break the balance of the natural environment of plants.

Q: Read the following article and select the best answer. Article: Heavy rains have caused disasters across China this summer, bringing the worst landslides in decades. The most deadly disaster happened on August 8 when a big landslide hit Zhouqu County in Gansu province, killing at least 1,407 people. On August 18, landslides hit Gongshan, a town in northwestern Yunnan. At least 38 people were killed and 54 are missing. Heavy rains also caused landslides in several counties in Sichuan province. People were forced to evacuate to safe places. Landslides and devastation Landslides take place when dirt and rocks slide down a slope together. Sometimes these landslides are small, and hardly noticeable. Other times however, they can be massive, involving the entire side of a mountain. Landslides can be caused by a number of different things. Often rain, which adds weight to the side of a slope, can cause one. Other times they might be caused by erosion .When a stream slowly removes the base of a slope, it weakens the entire side of the mountain. As a slide moves down a mountain slope, it can pick up great speed and energy. Some slides travel at a speed of 300km an hour. The resulting winds can be so powerful that they are known to strip the leaves off surrounding trees. Earthquakes and landslides Some experts think the landslides in Sichuan were related to the magnitude-8.0 Wenchuan earthquake on May 12, 2008. The quake has caused a change in the structure of the Earth's surface, making it more likely that land will slide in the rain, according to geologist Xu Qiang of the Chengdu University of Technology. Landslides pose threats to 140 cities and towns in the country, one quarter of which are in Sichuan, said Wei Fangqiang, a researcher with the Chinese Academy of Sciences. Landslide prevention If you want to avoid being a landslide victim, the easiest thing to do is avoid living on slopes or close to mountains. If you live in a landslide-threatened area, try not to water the slopes if possible. If there are large rocks on the slopes above your house, remove them so that they... Question: What is the main idea of the article? - Landslides and their prevention. - The after-effects of the Wenchuan earthquake. - The mostly deadly disaster in China. - How to survive a landslide.
A: Landslides and their prevention.

(Q).
Read the following article and select the best answer. Article: Zipped into a bag, it looks like a large umbrella. Unfolded, it goes along the street like any other bicycle. It's the "A-bike", the brainchild of British inventor Sir Clive Sinclair, who made history in the 1970s by developing the world's first pocket calculator. He described his new invention as "the world's smallest, lightest foldable bicycle". "My original thought was that if you could have a bicycle that was dramatically lighter and more firm than the ones that exist today, it would change the way in which bicycles are used,"said Sinclair. The mini-bike, showed in Singapore last week and set to go on sale worldwide in 2005 at a price of nearly US$300, is built for riders as heavy as 112 kilograms and is height-adjustable . It takes about 20 seconds to fold or unfold. Its wheels are a quarter the size of those on a regular bicycle, but Sinclair promises a smooth ride for most cyclists. "You require no extra energy to ride the A-bike and it can go up to 15 miles per hour (24 kilometers per hour)," he said. Constructed mainly of plastic, the 5.5-kilogram bicycle folds into a package of less than 0.03 cubic meters . Sinclair also invented the first pocket TV in 1984 and the futuristic C5 electric tricycle in 1985. He said he hoped the bicycle would attract common citizens, officials, campers or anyone needing transport for a short trip and he said the next step for the A-bike was to add an electric motor in a few years. Question: The most important character of this kind of bike is its _ . - big size - light weight - beautiful appearance - foldable structure
(A).
foldable structure