Read the article and select the best answer. Article: Searching for airfares often seems like a game that passengers are bound to lose. Prices change from day to day, even minute to minute. Looking through multiple websites for the best deal can be a big challenge. Even when you do book, there's no guarantee that you are going to get the best price. "You just don't know when to _ . It's not like buying anything else I can think of," said George Hobica, founder of Airfarewatchdog.com. Harriet Levy paid $179 for a recent round-trip flight on American Airlines between New York and Fort Lauderdale, Florida. Sitting just one row behind her, Shirley Harrison paid $215. A few rows back, Ellis and Dianne Traub paid $317 each. There were at least 12 fares on the flight, ranging from $169 to $360. There's no reason for it, Harrison said. Fares can fluctuate significantly in just a few hours. One Delta flight from New York to Los Angeles jumped from $755 to $1,143 from a Friday to Saturday in late April, then fell to $718 on Sunday. The flight was one of a dozen the Associated Press followed over three months for a vacation between July 16 and 22. The number one finding: avoid booking tickets on weekends. It's the most expensive time to buy. There's no way to guarantee the best fare. But before booking, travelers should pay attention to this additional advice: * Book on Tuesday, Wednesday and Thursday. That's when airlines most often offer sales. * Buy in advance, but not too early. The best time is four to six weeks before traveling. In general, prices for any given flight are highest eight to 10 weeks and two to three weeks in advance. * Make use of social media. Airlines are giving more benefits like exclusive sales to travelers who interact with them on Twitter and Facebook. Those specials are often gone within hours. * The so-called discount airlines - JetBlue, Air-Tran, Southwest and Frontier - adjust their fares less frequently than other airlines, so you can feel more confident that the price will stay the same. But their prices aren't always the lowest.... Question: By using a lot of figures, the author intends to _ . Options: A: show there is standard price for every single airline B: discover the rules behind airfares C: guarantee passengers a low price D: prove airfares can vary widely
D

Read the article and select the best answer. Article: China Mobile, the country's largest mobile communications operator, has accounted for nearly 40 percent of revenues in the domestic telecoms market. That puts it at the top of the six major telecoms operators in the nation, according to the latest official statistics . The other five are: China Telecom, 31.1 percent; China Netcom, 16.6 percent; and China Unicom, 13.4 percent; China Satellite Communications Corp and China Rilcom, 1.5 percent. Mobile communications and the IP phone business have gradually replaced traditional long-distance calls. Mobile communications account for 28.5 percent of the total long-distance communications business. IP phones have 41.4 percent, while traditional long-distance calls are down to 30.1 percent. In another ranking , Nokia, Motorola, Bird, TCL and Siemens came in as the top five mobile phone sellers in China in the first half of this year, according to South Daily. They report also says that during this period, prefix = st1 /Chinaproduced 82 million handsets (including GSM, GPRS and CDMA phones) and sold 80 million. Of the phones sold, 37 million were exported to other countries. Analysts point out that China's lack of key technologies and its heavy dependence on overseas technologies have proved to be an obstacle for development of home-made phone makers. Question: From the passage, which is NOT true? Options: A: China Mobile isChina's largest mobile phone sellers. B: China Mobile isChina's largest mobile communications operator. C: China Mobile has covered nearly two fifths of the income in the telecoms market inChina. D: China Mobile has taken the first place in the telecoms market.
A

*Question*
Read the article and select the best answer. Article: Dozens of dolphins swam out of the polluted waters of Haifa Harbor on Tuesday.This was the first time that dolphins had visited this crowded Mediterranean port,and researchers were surprised and delighted by the unexpected event. Between 40 and 50 of the dolphins appeared in the busy port on Tuesday morning,obviously drawn by the fishrich waters of Haifa Harbor. However,the bay is also full of harmful chemicals. Aviad Sheinin,professor of Haifa University's Maritime Studies Department,said he didn't think the dolphins were harmed by the pollution,but he hoped that they would swim back to the sea soon. "It seems that they are quite relaxed. They don't seem to be stressed," he said. Haifa Harbor is lined by chemical companies that have been pouring poisonous waste into the water for decades. While pollution levels have dropped in recent years,the water is still considered a health hazard. "There are lots of fish in Haifa Harbor. Unfortunately we couldn't tell the dolphins that the fish are not healthy;and I don't know what the result will be," he told Israel Army Radio.Hundreds of Haifa residents gathered around Haifa Harbor to see the interesting sight,and researchers said this provided a rare chance to film and study the roughtoothed dolphins. In addition to the dozens of dolphins which swam into the port on Tuesday,a similar number stayed outside the breakwater .Later Tuesday the dolphins left the port but remained near the entrance and Israel's coast guard was patrolling the area to try to make sure the dolphins didn't reenter the poisonous waters. Relatively little is known about roughtoothed dolphins,which are usually found in deep and warm tropical waters. Question: Aviad Sheinin's words suggest that _ . Options: A: the dolphins might affect the existence of fishes in Haifa port B: he is curious about the dolphins C: he will do research on the dolphins D: he is uncertain about what will happen to the dolphins
**Answer**
D