[单项选择]主动脉在维持舒张压中起重要作用,主要是由于主动脉 ( ) A. 口径大 B. 管壁的扩张性和弹性 C. 管壁厚 D. 血流速度快 E. 对血液的摩擦阻力小
参考答案:B
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第1题: [单项选择]Questions 11 to 18 are based on the conversation you have just heard. A. He has some money to buy a new car. B. He wants to buy a new house and a new car. C. He will spend much money on his house. D. He fails in borrowing enough money from the woman. 参考答案:D 答案解析:[听力原文] M: I wish to buy a new car, but I spent too much on my house last year. So I wonder if you