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SC强化(261-280)

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题号 选项内容 操作
doubling to 12 the number of satellites now known to orbit

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doubling to 12 the number of satellites now known as orbiting

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a pay-as-you-go approach is the foundation of Social Security

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Social Security is founded on a pay-as-you-go approach

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resulting from the destruction of the largest library of the ancient world at Alexandria,

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as a result of the destruction of the library at Alexandria,the largest of the ancient world,

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huge palace and temple clusters were built by the Maya without benefit of the wheel or animal transport

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the Maya built huge palace and temple clusters without the benefit of animal transport or the wheel

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it not at Plymouth but

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so not at Plymouth but

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together--and that thus represents

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together, and it represents

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orbits near Earth have become more and more littered, often from

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there have been more and more littering of orbits near Earth, often because of

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as much as even

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even so much as

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have half the chance, or less, of dying of a heart attack than those who are sedentary do

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are at least fifty percent less likely than those who are sedentary to die of a heart attack

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Concerns about public health led to the construction between 1876 and 1904 of three separate sewer systems to serve

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Concerns about public health have led to the construction of three separate sewer systems between 1876 and 1904 to serve

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on whether significant warming will occur and what impact will it have if it does

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over whether significant warming will occur and what impact it would have

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Although heirloom tomatoes, grown from seeds saved during the previous year, appear less appetizing than most of their round and red supermarket cousi

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Grown from seeds saved during the previous year, heirloom tomatoes appear less appetizing than most of their round and red supermarket cousins

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and producing enough energy on a commercial scale for electricity to be generated efficiently and to heat

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to produce energy on a commercial scale, enough for generating electricity efficiently and for heating

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who still harbored the illusion that E-mail exchanges are private, a watchdog group recently uncovered a trick for enabling an interloper to rig an E-

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who still were harboring the illusion that E-mail exchanges are private, a watchdog group recently uncovered a trick enabling an interloper to rig an

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still harboring the illusion that E-mail exchanges are private, a watchdog group recently uncovered a trick that enables an interloper to rig an E-mai

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officially known as the Flavian Amphitheater, begun in A.D. 69, during the reign of Vespasian, and

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which was officially known as the Flavian Amphitheater, began in A.D. 69, during the reign of Vespasian, and

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which removes only selected trees, or surface fires that burn

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removing only selected trees, or surface fires, burning

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as great as or greater than that of using air conditioning

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at least as great as that incurred by using air conditioning

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an event that caused plant and animal extinctions, and it marks

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an event that caused the plant and animal extinctions that mark

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the same as attempting to sing like a sick parakeet when one is intoxicated

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the same as an intoxicated person singing like a sick parakeet

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with each as a product of its

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each a product of

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