27.Silicon chips are reliable and cheap to produce in large numbers and
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are used them in cpmputers,calculators,programmed household appliances,
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and most electronic applications.
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ans:B
37.The Louisiana Purchase of 1803 increased the territory of the United
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States by approximate 846,000 square miles,practically doubling the
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area of the United States.
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ans:B
approximate可當形容詞，形容 846,000 square miles
要怎麼改才是正確？
以上兩題怎麼改才是正確的，
拜託各位大大了
謝謝
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