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  • 829人已做

    600

    【句子改错SC】-8477-OG16

    Sunspots, vortices of gas associated with strong electromagnetic activity, are visible as dark spots on the surface of the Sun but have never been sighted on the Sun’s poles or equator.

  • 826人已做

    600

    【句子改错SC】-8478-OG16

    Warning that computers in the United States are not secure, the National Academy of Sciences has urged the nation to revamp computer security procedures, institute new emergency response teams, creating a special nongovernment organization to take charge of computer security planning.

  • 1112人已做

    650

    【句子改错SC】-8479-PREP07

    Less than 35 years after the release of African honeybees outside Sao Paulo, Brazil, their descendants, popularly known as killer bees, had migrated as far north as southern Texas.

  • 676人已做

    600

    【句子改错SC】-8480-OG16

    A pioneer journalist, Nellie Bly’s exploits included circling the globe faster than Jules Verne’s fictional Phileas Fogg.

  • 1246人已做

    650

    【句子改错SC】-8481-PREP07

    Nikola Tesla, the inventor of alternating current, because he was excited with the prospects of harnessing Niagara Falls for producing electric power, he predicted in the mid-1890's that electricity generated at Niagara would one day power the streetcars of London and the streetlights of P...

  • 1268人已做

    600

    【句子改错SC】-8482-OG16

    Retail sales rose 0.8 of 1 percent in August, intensifying expectations that personal spending in the July–September quarter more than doubled that of the 1.4 percent growth rate in personal spending for the previous quarter.

  • 1051人已做

    600

    【句子改错SC】-8483-PREP07

    The airline company, following through on recent warnings that it might start reducing service, announced that it was eliminating jet service to nine cities, closing some unneeded operations, and it grounded twenty-two planes.

  • 959人已做

    600

    【句子改错SC】-8484-OG16

    The commission has directed advertisers to restrict the use of the word “natural” to foods that do not contain color or flavor additives, chemical preservatives, or nothing that has been synthesized.

  • 992人已做

    650

    【句子改错SC】-8485-OG16

    Plants are more efficient at acquiring carbon than are fungi, in the form of carbon dioxide, and converting it to energy-rich sugars.

  • 1214人已做

    650

    【句子改错SC】-8486-PREP07

    The list of animals that exhibits a preference of either using the right or the left hand (i.e., claw, paw, or foot) has been expanded to include the lower vertebrates.

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  • 【数据充分DS】-11692

    Is the integer x divisible by 6 ? (1) x + 3 is divisible by 3. (2) x + 3 is an odd nu...

    172人做过-2条评论-59.3%正确率

  • 【数据充分DS】-12178

    Ann bought five different kinds of fruit: apples, oranges, pears, mangoes, and bananas. If the number of apples that Ann bought was twice the number of oranges and if the number of pears that Ann boug...

    33人做过-1条评论-81.8%正确率

  • 【句子改错SC】-10573

    Introduced by Italian merchants resident in London during the sixteenth century, in England life insurance remained unti...

    687人做过-2条评论-81.7%正确率

  • 【句子改错SC】-10594

    Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its developmen...

    591人做过-5条评论-82.2%正确率

  • 【句子改错SC】-10641

    While studying the genetic makeup of corn, a new class of mutant genes was discovered by Barbara McClintock, a...

    585人做过-2条评论-77.9%正确率

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