测定内生肌酐清除率应注意做到（） A.低蛋白禁肉食7d B.同时测定血和尿肌酐

Children today would rather toy with new technologies. The role of children has changed as well as that of teens. The world has truly evolved (进化）throughout the years.

Today，a typical day in the life of a five year old is entirely different from what it once was. A few decades ago children used to work. They did the kind of work parents do today. Today there are shows on which children are putting pounds of makeup on and have flashing things all over their bodies. This makes a child want to paper over all of their imperfections. They think they have to look perfect all the time.

Teens have changed as well. My grandma got married when she was thirteen. Girls who had an arranged marriage had no time to play because they were expected to cook, clean，take care of the kids, and do housework every single day. Today，we go to school every morning, maybe participate in some after-school activities, and possibly go to work for extra cash. Then we go home and do homework, and eat. After all of this we have to find the time to socialize by texting, talking on the phone, or logging on to social networking sites. We enjoy ourselves a lot.

The generation before us complains about how they did not have the things we have now. They say we are not appreciative and do not value life or just do not care about our futures anymore. Let's make a change! The youth have the power to work on whatever they believe in and make a difference in the world. Take advantage of your resources. It is never too late to make a positive change in our world.

小题1:The role of children and teens has changed mainly because _____.

A．new technologies are developing and widely used

B．they don't have to work hard as their parents did

C．their world has truly evolved

D．they look perfect all the time小题2:The underlined phrase (in the 2nd Para. ) probably means to _____.

A．put up with

B．make up for

C．put aside

D．cover up小题3:We can learn from the text that nowadays teenagers _____.

A．do housework as their parents did

B．are having a social life in richer ways

C．are seldom satisfied with what they have

D．don't appreciate and value life小题4:The author's attitude towards changes of teen’s life is _____.

A．critical

B．neutral

C．optimistic

D．complaining

无用之无的真实意义是什么？（）

A.超越束缚

B.无所作为

C.一无是处

D.一无所有

项目前期阶段的工程咨询业务一般范围不包括( )。

A．项目规划咨询
B．工程设计
C．项目决策咨询
D．项目机会研究

较常见外阴发育异常及畸形（）

A．阴蒂肥大、大阴唇融合、阴唇粘连、处女膜闭锁、先天性前庭尿瘘与粪瘘，两性畸形

B．有先天性无 * * 、 * * 横膈、 * * 纵隔、 * * 斜隔、 * * 闭锁和狭窄等。治疗常延至青春期后做手术整形

C．双子宫，纵隔子宫，单角子宫，双角子宫等

D．雄激素不敏感综合征

E．特纳综合征

已知××公司的库存信息如下：
(1)年需求数量为30000单位(假设每年360天)；
(2)每单位库存每年的保持费用为20元；
(3)现在每次订货数量为600单位；
(4)实现每次订单的费用为30元；
(5)订货数量只能按lOO的倍数(四舍五入)确定。
求：(1)年维持费用(年维持费用=平均库存×每单位库存每年的保持费用)。
(2)年订货费用(年订货费用=年订单次数×每份订单的费用)。
(3)年总费用(年总费用=年维持费用+年订货费用)。
(4)当订货数量为1000单位时的年总费用。
(5)最优经济订货量为多少