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A. Its subjects are too simple to use the formula.
B. The formula is good for this kind of writing.
C. Its subjects require deep thoughts and investigation.
D. Careful thinking should be throughout the process of writing.
氯丙嗪可因其具有明显的阻断___________受体的作用，而引起体位性低血压；因其具有___________ 受体阻断作用，而引起口干、便秘和视力模糊等现象；因阻断黑质-纹状体通路___________受体，使纹状体中___________能神经功能减弱，___________能神经功能相对增强而引起锥体外系反应。阻断结节一漏斗通路的___________受体后，可导致内分泌紊乱。
游离缺失者，末端为前磨牙支持条件差，应设计卡环种类是
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A. Get up at 7 o"clock next morning.
B. Know when the breakfast is served.
C. Get the phone number of the service desk.
D. Arrange a wake-up call for breakfast.
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