第5题: [单项选择]以下哪个不是孤独症的高危因素()。 A. 脑瘫 B. 遗传因素 C. 高龄产妇 D. 双胎妊娠 E. 巨细胞病毒感染 参考答案:D 答案解析:孤独症病因未明,但与下列因素有关:遗传因素、高龄母亲、母亲先兆流产史、早孕感染史,许多患儿合并器质性脑部疾病,包括脑瘫、先天性疱疹、结节性硬化、巨细胞病毒感染、弓形虫病等,故正确答案为D。
第14题: [单项选择]By the end of next year, they______ three modem hotels there. A. will build B. will be building C. will have been built D. will have built 参考答案:D 答案解析:本题考查的是将来完成时的用法。A和B不是将来完成时,应排除。虽然C和D都是将来完成时,但C是被动语态的将来完成时,在句中不适合。只有D适合。
第22题: [单项选择]作用持续时间最短的镇痛药是() A. 哌替啶 B. 阿芬太尼 C. 芬太尼 D. 喷他佐辛 E. 曲马朵 参考答案:B 答案解析:阿芬太尼为芬太尼的类似物,主要作用于μ受体,对δ和K受体作用较弱。阿芬太尼的镇痛作用弱于芬太尼,但起效快,作用时间短,称为超短效镇痛药,血浆t为1~2小时。
第23题: [单项选择]A. She feels it is no concern of hers. B. She is astonished that the bus company is doing it. C. She is sure that many people will stop taking the bus. D. She is surprised by the lack of public concern. 参考答案:D 答案解析:[听力原文] M: Have you heard that they are talking about raising the bus fare again W: Yes, and