Read the following article and select the best answer. Article: The name sounds funny but the idea is no joke: it's a personal toilet called the pee-pool, Anders Wilhelmson, a Swedish architect, is the inventor of the pee-pool. He became interested in the idea of sanitation after taking part in a research project on the social and political development of cities, One of the most common problems he found in developing countries was the lack of toilets, He wanted to do something to help, So working with others, he started the project in 2005, and the next year started a company called Peepoolple. The toilet is a single--use bag made of environmentally friendly plastics, The inside is treated with urea , a chemical commonly used as fertilizer, The hotter the weather, the more quickly the waste turns into what is needed by plants The sanitation process can be as soon as a couple of hours or as long as two to four weeks ,You can just bury it in a pot and grow whatever you like. The company expects to start selling the bags in August in Kenya and Bangladesh, But it is just beginning production and sales in Nairobi now, Full production could reach about half a million bags a day and people may be able to buy the pee-pool in countries Vietnam, Bangladesh, etc. The United Nations says more than two and a half billion people around the world do not have good sanitation .Many have no choice but to use the outdoors, which is not only bad for the environment ,but also harmful to people's health, Each year, poor sanitation leads to three fifths of those people getting an infectious disease which on average causes one out of 1,000 patients to die. Jack Smith, the founder of the World Toilet Organization, says " _ is quite an unacceptable situation given the fact that we are living in the modem world, And strangely, many of them own televisions, phones but have no toilet." Question: What was the original purpose of Anders Wilhelmson in starting the company? - To protect the local environment - To earn a lot of money from the project - To do research on the social development - To help solve the problem of lack of toilets in developing countries
To help solve the problem of lack of toilets in developing countries

Read the following article and select the best answer. Article: Have you ever thought of joining a book club and buying new books through the post? Here at the International Book Club, we already have many members buying books from us by mail. Immediate benefits: *As a special offer, you may choose any reduced-price books from our new members' book list, to the value of $6 in total (plus postage and packing). By doing this, you will save pounds on the publishers' prices. *Tick the box on your form to order a free watch. *If you reply within seven days, we will send you another free gift carefully chosen from our book list by our staff. *Order a DVD from the many on offer in our list, at half the recommended retail price. *When you've joined: As a member, you'll enjoy savings of between 30% and 50% off the publisher's price on every book you buy, and what's more, they'll come straight to your door. Your free club magazine arrives once a month, to keep you up-to-date with the latest bestsellers. This means that every year we offer over 1,000 books to choose from. On the Internet, you can find all our titles for the year on our exclusive members' website. Being a member: All we are asking you to do while you are a member is to choose four books during your first year. After that, you can decide on the number of books you wish to take. In each of our monthly club magazines, our experienced staff choose a Club Choice book -- a work of fiction or a reference title which they feel is particularly worth buying, and which is offered at an extra-special price. However, if you do not want this book, just say so in the space provided on the form. We will always send the book if we do not receive this. So, return your application form today, but hurry -- it's not every day we can make you an offer like this. To apply to become a member, all you need to do is simply fill in the enclosed form and return it in the envelope supplied. Before you know it, your books will be with you. Please don't send any money now, as we will send you your bill with the books. And remember, you have up to... Question: Every month the club provides a free club magazine in order to _ . - let readers know the number of books to be sold - attract more and more readers to join the club - make readers know the club's development - keep readers well informed of recent bestselling books
keep readers well informed of recent bestselling books

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Read the following article and select the best answer. Article: If you look at the night sky, you'll often see stars moving very quickly. In fact, they move much more quickly than they should according to their size and the laws of physics. Scientists do not completely understand why the speed of these stars is so high. But many believe the reason is that much of the universe is made of something called "dark matter". Groups of stars called galaxies, such as the Milky Way, might even be made up of 90 percent dark matter. How much something weighs depends on where it is. The same object weighs only half as much on Mars as it does on Earth and almost three times as much on Jupiter. So scientists prefer to talk about the mass of something rather than how much it weighs, because mass does not change. They can work out the mass of galaxies by measuring the distance between them and the speed they move at. Recently, Jorge Penarrubia, a senior academic at Edinburgh University, UK, and his team discovered something interesting: The mass of the Milky Way is only half as much as the mass of another nearby galaxy, Andromeda. This seems strange, and dark matter may explain why. Finding out more about dark matter could help us understand how the universe began, but this is not easy. Lots of scientists with different types of expert knowledge are working on the problem. We can't see dark matter, it's very difficult to measure and we can't find out its mass. Unlike stars, dark matter doesn't produce or reflect light. But we can make a good guess that it is there because of the way things move and the way light bends. Experts now think dark matter may be very different from the matter that we find on Earth. There may also be five times as much dark matter in the universe as ordinary matter. Question: Dark matter is difficult to investigate because _ . - it travels at a very fast speed - we can't see where it is or measure its mass - it's hard to measure the light it produces and reflects - it is much bigger than ordinary matter in size
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we can't see where it is or measure its mass