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听力原文：Thanks for what you have done for me.
(5)

A. I don' t mind.
B. You are so nice.
C. I'll do it.
D. That's all right.

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Although aluminum is not attracted by ordinary magnets, under special conditions it becomes temporarily "paramagnetic", or very weakly responsive to a magnetic field. This is achieved by immersing ore particles in water to which certain salts have been added and then filtering the ore through steel wool in the presence of a strong magnetic field. It is hoped that this technique will reduce the amount of high-grade aluminum the United States must import.
The passage focuses on ______.

A. construction and manufacturing industry in the United States
B. new technique of obtaining aluminum from poor ores
C. consumption and production of aluminum in the United States
D. the annual import of high-grade aluminum into the United States

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将标准深度100英尺4等分，每一等份的价值占路线价的比例分别为37.5%、29.5%、 20.7%、12.3%的路线法则是()。

A. 慎格尔法则
B. 苏慕斯法则
C. 霍夫曼法则
D. 哈柏法则

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商品房预售后因不可抗力或者其他原因，需延期交付使用的，房地产开发企业应当及时告知买受人。

A. 正确
B. 错误

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统计数据中多个基本数据项可以依据其间的内在联系组成组合数据项。

A. 正确
B. 错误

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听力原文：Thanks for what you have done for me.(5)

A. I don' t mind. B. You are so nice. C. I'll do it. D. That's all right.

将标准深度100英尺4等分，每一等份的价值占路线价的比例分别为37.5%、29.5%、 20.7%、12.3%的路线法则是()。

商品房预售后因不可抗力或者其他原因，需延期交付使用的，房地产开发企业应当及时告知买受人。

统计数据中多个基本数据项可以依据其间的内在联系组成组合数据项。

听力原文：Thanks for what you have done for me.
(5)

A. I don' t mind.
B. You are so nice.
C. I'll do it.
D. That's all right.