第9题: [单项选择]嗅阈是()。 A. 多数人可以嗅到的最低嗅剂浓度 B. 能引起嗅觉的有效气体浓度 C. 单位时间内一定数量的某种气味分子随气流到达嗅区,刚能引起嗅细胞兴奋最小刺激的气体分子的相对分子质量 D. 单位时间内一定数量的某种气味分子随气流到达嗅区,刚能引起嗅细胞兴奋最小刺激的气体分子的量 E. 以上说法均不正确 参考答案:D
第10题: [单项选择]Passage Three
Questions 33 to 35 are based on the passage you have just heard.
A. He watches T.V. programs only selectively. B. He doesn’t like watching sports programs. C. He can’t resist the temptation of T. V. either. D. He is not a man who can keep his promise. 参考答案:C 答案解析:短文中作者一直在说看电视的坏处,但最后当舍友想换台时,作者却阻止,因为他想知道谋杀案的结局。由此推断,作者也不能抵挡住电视的诱惑。故选C)项。
第17题: [单项选择]Passage OneA. They are indulged in the virtual world. B. They spend little time on their schoolwork. C. They take advantage of the Internet to threaten others. D. They are reluctant to interact with others in the real world. 参考答案:C 答案解析:[解析] 26-28 The Internet has created a whole new world of social communications for young peop
第20题: [单项选择]彩色血流多普勒显像检查时彩色增益过高,会出现什么现象() A. 血流信号显示不连续,有中断现象 B. 彩色血流信号溢出到血管外,使血流假性增宽 C. 血流充盈不好,血管内有假性充盈缺损 D. 血流信号缺乏,假性闭塞 E. 彩色信号出现翻转(倒错),血流行走方向反向 参考答案:B