阅读理解

　　While Jennifer was at hose taking an online exam for her business law class, a monitor(监控器)a few hundred miles away was watching her every move．

　　Using a web camera equipped in Jennifer's Los Angeles apartment , the monitor in Phoenix tracked how frequently her eyes moved form the computer screen and listened for the secret sounds of a possible helper in the room．Her Internet access was locked －remotely－to prevent Internet searches , and her typing style was analyzed to make sure she was who she said she was：Did she enter her student number at the same speed as she had in the past? Or was she slowing down?

　　In the battle against cheating , this is the cutting edge and a key to encourage honesty in the booming field of online education．The technology gives trust to the entire system, to the institution and to online education in general．Only with solid measures against cheating, experts say, can Internet universities show that their exams and diplomas are valid－that students haven't just searched the Internet to get the right answers．

　　Although online classes have existed for more than a decade ，the concern over cheating has become sharper in the last year with the growth of "open online courses．" Private colleges，public universities and corporations are jumping into the online education field．spending millions of dollars to attract potential students，while also taking steps to help guarantee honesty at a distance．

　　Aside from the web cameras, a number of other high-tech methods are becoming increasingly popular Among them are programs that check students' identities using personal information, such as the telephone number they once used．

　　Other programs can produce unique exam by drawing on a large list of questions and can recognize possible cheaters by analyzing whether difficult test question are answered at the same speed as easy ones ,As in many university classes ,term papers are scanned against some large Internet data banks for cheating．

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阅读下列短文，从每题所给的A、B、C和D项中，选出最佳选项。

　　Bloodsucking bed bugs(臭虫)have made a comeback in recent years．But as victims of affection have become increasingly desperate to rid their homes of the disturbing pests, many have only done themselves more harm．

　　Bed bugs do not transmit disease or cause illness-but the insecticides used to make them do．A total of 111 illnesses associated with bed bug-related insecticides were reported in seven states between 2003 and 2011, the Centers for Disease Control and Prevention(CDC)said on Thursday．Most cases of poisoning were not severe, but the data included one death．

　　That case involved a 65-year-old woman in North Carolina who died in 2011．After she complained to her husband about bed bugs, the CDC report said, he sprayed the inside of their home, including the baseboard, walls, and the area around the bed, with the insecticide Ortho Home Defense Max．He then applied a different product, Ortho Lawn and Garden Insect Killer, to their bedding．Neither insecticide is registered for use against bed bugs, the CDC said．That day, the couple also emptied nine cans of Hot Shot Fogger in their home．Two days later, they reapplied the insecticides and released nine more cans of Hot Shot Bedbug and Insect Killer．The woman then applied the insecticide Hot Shot Bedbug and Insect Killer directly to her arms and chest, and wet her hair with it before covering her head with a plastic cap．

　　Two days later, her husband found her．She was taken to the hospital where she remained on a ventilator(呼吸器)for nine days until she died．The woman had had a history of health problems, including kidney(肾)failure, heart disease, high blood pressure and, and depression, the CDC report said．She had been taking at least 10 kinds of medicine at the time of her death．

　　Aside from the one reported death, most other cases of poisoning were mild．Commonly reported symptoms of exposure included headache and dizziness, breathing difficulties．

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