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Read the following article and select the best answer. Article: With the crazy smog going on in China, businessmen are now ready to grope for your wallet. "Smog economy" is stimulating a shopping _ on certain products against the terrible weather. Now let's see what we have on the list to help us through the crisis. 1. Masks Well, I would say you had better stay indoors to save your lives. PM 2.5 just surged up to 750 in Beijing recently. 3M just sold 220,000 masks of a kind. No.1 best-selling products! 2. Air purifiers This kind of products is rarely seen in Chinese households in the past. They have become a necessity now. I do like these little gadgets, but they are just too expensive. 3. Oxygen inhalers I didn't realize oxygen inhalers also get a cut in the smog economy. As a matter of fact, your oxygen uptake has nothing to with relieving the impact of smog. It might even lead to oxygen poisoning when you inhale too much oxygen. So don't get greedy. 4. Salt lamps Compared to oxygen inhalers, salt lamps are even worse. Some stores are selling the products at several hundred yuan, saying that they can release negative ions , reduce radiation levels and purify the air. The lamps mainly contain sodium chloride. The boiling point of sodium is about 800 degrees centigrade and that of candle is 500. So how on earth can negative ions be released at only 500 degrees? 5. Plants that absorb smog Yeah, right. Plants Vs Smog. It is scientifically justified that some plants do absorb pollutants from the air. Money plants and calla lilies are among the best-sellers in the market. Even if they don't work, it's good to have some plants in the house anyway. Question: Salt lamps are useless, because _ . - it may cause poisoning - it actually can't release the negative ions - it reduces radiation level and makes the air dirty - the prize is very high
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it actually can't release the negative ions

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Read the following article and select the best answer. Article: Since many of you are planning to study at a college or university in this country, you may be curious to know what you usually do in a typical week, how you can get along with your fellow students, and so on. These are the questions I want to discuss with you today. First, let's talk about what your weekly schedule will look like. No matter what your major may be, you can expect to spend between four and six hours a week for each class attending lectures. Lectures are usually in very large rooms because some courses such as introduction to sociology or economics often have as many as two or three hundred students, especially at large universities. In lectures, it's very important for you to take notes on what the professor says because the information a lecture is often different from the information in your textbooks. Also, you can expect to have exam questions based on the lectures. So it isn't enough to just read your textbooks; you have to attend lectures as well. In a typical week you will also have a couple of hours of discussion for every class you take. The discussion section is a small group meeting usually with fewer than thirty students where you can ask questions about the lectures, the reading, and the homework. In large universities, graduate students, called teaching assistants, usually direct discussion sections. If your major is chemistry, or physics, or another science, you'll also have to spend several hours a week in the lab, or laboratory, doing experiments. This means that science majors spend more time in the classroom than non science majors do. On the other hand, people who major in subjects like literature or history usually have to read and write more than science majors do. Question: We can learn from the passage that university professors _ . - spend about 5 hours on lectures each week - must join the students in the discussion sections - require the students to read beyond the textbooks - prefer to use textbooks in their lectures
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require the students to read beyond the textbooks

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Read the following article and select the best answer. Article: Traffic problems are an everyday concern in many cities,including Washington,DC.A growing number of Washingtonians are turning to bicycles to get to and from work.In fact,the number of commuters who use bicycles has doubled in the city since 2007. Ralph Buehler teaches urban planning at the Virginia Polytechnic Institute and State University,popularly known as Virginia Tech.He has written a book about urban biking,called "City Cycling". He says there is a reason why urban bike tiding is now becoming more popular. "Over the last 60 to 70 years.cities in the U.S.have been adapted to the automobile." "Most cities took advantage of the money coming for the interstate highway system,from the federal government,starting in 1956.There was a 90 percent federal match so the cities only had to put up 10%.It was very tempting." In the years after World War Two,many Americans moved to suburban communities,just outside major cities,They decided to travel great distances to and from work in exchange for a home in the suburbs.Their cars became a symbol of freedom. But today,many people believe they can save money by living in the city. Greg Billing is with the Washington Area Bicyclist Association."When a person makes a change from 04 using a car to using a bike,they are saving anywhere between 8 or$9,000 a year." Ralph Buehler says governments save money when people use bicycles."Building bicycling facilities is much cheaper than building and maintaining road facilities or public transport." Washington,DC has also taken steps to protect bike riders.It approved a safe passing law and created areas on the road between cars and bikes. The United States Census Bureau says 4%of the city's workers ride to work by bike.The only city on the East Coast with more bike commuters is New York. Question: What's the best title of the text? - Traffic problems are an everyday concern in many cities - Bicycling to work in Washington,DC grows in popularity - Bikes result in new problems in Washington,DC - Washington,DC has taken steps to protect bike riders
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Bicycling to work in Washington,DC grows in popularity