单选题：Some students in Northwestern University

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Some students in Northwestern University A．proved some prisoners were not guilty
B．believed some suspects were from ethnic groups
C．told the governors of Illinois not to free the prisoners
D．showed DNA testing was not always reliable

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The walls are made of hollow concrete blocks。

The walls are made of hollow concrete blocks。 A．big B．long C．new D．empty

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Newborn babies can discriminate between a man’s and woman’s

Newborn babies can discriminate between a man’s and woman’s voices. A．treat B．ex

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The expression "this form of life" in paragraph 5 refer to?

The expression "this form of life" in paragraph 5 refer to? A．Water-based life.

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The earthquake that hit the eastern half of the United State

The earthquake that hit the eastern half of the United States two centuries ago

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交易者可以通过期货市场卖出被高估的商品合约，买入被低估商品合约进行套利，等有利时机出现后分别平仓，从中获利。（　　）

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