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第1题

12(5.0分) 5.0 Mary is always ready to help others when they are in trouble and she never ____ their requests. A) t
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第2题

11(5.0分) 5.0 Shelly had prepared carefully for her English examinations so that she could be sure of passing it in
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第3题

具有四级结构的蛋白质，它的每个亚基单独存在时仍能保存蛋白质原有的生物活性。
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第4题

10(5.0分) 5.0 Shelly had prepared carefully for her English examinations so that she could be sure of passing it in
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