单选题：Retention refers to _________.

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题目内容：
Retention refers to _________. A．for younger and older people
B．to the proper function of your memory
C．is called long-term memory
D．the capacity to store what you have learned
E．belongs to very long-term memory
F．the ability to remain mentally healthy

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During the experiment, Gardner slept for two hours every nig

During the experiment, Gardner slept for two hours every nightr.A．Right B．Wrong

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请在第 _(57)__ 处填上正确答案。

请在第 _(57)__ 处填上正确答案。A．result B．reason C．purpose D．product

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One cannot live ___________

One cannot live ___________A．in your body B．without water C．before long D．for a

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Petitions have been taken to be one of the ways for the Brit

Petitions have been taken to be one of the ways for the British people to expr

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有机药物多数为弱酸或弱碱，在体液中只能部分解离，以解离的形式非解离的形式同时存在于体液中，当PH=pKa时，分子型和离子

有机药物多数为弱酸或弱碱，在体液中只能部分解离，以解离的形式非解离的形式同时存在于体液中，当PH=pKa时，分子型和离子型药物所占的比例分别为（　　）A．90%

分类：卫生类  题型：单选题
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