搜题请搜索小程序“爱下问搜题”
问题 单项选择题

为了比较各国家，各地区龋齿情况，WHO规定的龋齿患病水平衡量标准是（）

A.12岁儿童的患龋率

B.15岁儿童的患龋率

C.12岁儿童的龋均

D.15岁儿童的龋均

E.学龄儿童的龋病发病率

答案

参考答案：C

阅读理解
任务型阅读
五位中国学生想去世界名校学习，请仔细阅读第1－5题中的学生个人信息和他们的态度，然后从A至F六个选项中，帮助他们选择最合适的大学(其中一项为多余选项)。
UniversityCountryPopular majorsOther information
AThe university of MelbourneAustraliaArts11 art clubs
BThe Chinese University of Hong KongChinaBusiness
Nursing		Free school bus
CThe University of TokyoJapanEarthquake Study;
Engineering 		Easy to get part-time jobs
DThe University of Leeds The UKBusinessMany  libraries
EThe University of MichiganThe USAEngineeringLarge libraries
FThe University of PennsylvaniaThe USAartsNear the city center
( )1. Li Qi plans to study in England. She likes universties with many libraries.
( )2. Chen Jun hopes to major in Engineering. He wants to get a part-time job during his study.
( )3. Xia Jie dreams to be a businessman. Hong Kong is his favorite city.
( )4. Han Yi would like to study at a university in the USA. He is interested in Engineering.
( )5. Sun Hao wants to learn Arts. She thinks joining an art club can be helpful.
查看答案
选择题

糖类、脂质、蛋白质、核酸共有的元素是[ ]

A．C、H、O、N、P

B．C、H、O、N

C．C、H、O

D．O、H

查看答案