单选题：If it __________ for his bad cold, Rick would have enjoyed

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题目内容：
If it __________ for his bad cold, Rick would have enjoyed more on his birthday party. A．is not
B．were not
C．has not been
D．had not been

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下列生物中属于真核生物的一组是（　　）。 ①颤藻②酵母菌③草履虫 ④黑藻⑤水绵⑥大肠杆菌 A．①⑤⑥ B．②③⑥ C．①②③ D．②③④⑤

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双酚A是一种化工原料，对动物生殖机能有影响。研究人员进行双酚A对中国林蛙精巢芳香化酶水平的影响。主要过程是：将性成熟雄蛙分组。实验组置于含双酚A的水体饲养，同时

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