所谓绿色贸易壁垒是指一种以保护有限资源、环境和人民健康为名，通过蓄意制定一系列苛求的

设函数void subone(int &)将形参减1，如有整型变量int k=10，则执行subone(k)；后，k的值为（ ）

A．9

B．10

C．11

D．未知

某单位购入设备一台，价款100万元，用银行存款支付60万元，另40万元则签发了商业汇票。对这一经济业务，单位应编制的记账凭证为( )。

A．编制一张转账凭证

B．编制一张收款凭证

C．编制一张付款凭证

D．编制一张转账凭证和一张付款凭证

如图所示，半径为R的半圆形区域内分布着垂直纸面向里的匀强磁场，磁感应强度为B，半圆的左边垂直x轴放置一粒子发射装置，在-R≤y≤R的区间内各处均沿x轴正方向同时发射出一个带正电粒子，粒子质量均为m、电荷量均为q、初速度均为v，重力忽略不计，所有粒子均能穿过磁场到达y轴，其中最后到达y轴的粒子比最先到达y轴的粒子晚△t时间，则（　　）

A．粒子到达y轴的位置一定各不相同

B．磁场区域半径R应满足R≤

C．从x轴入射的粒子最先到达y轴

D．△t=

阅读理解.

   Today, people all over the world are moving out of small villages in the country to go and live in big,

noisy cities. They  are moving  from  the  peaceful  hills, mountains,  fields,  rivers  and  streams of  the

countryside to the busy world of streets, buildings, traffic and crowds.This movement from rural(乡下的)

areas to urban areas has been going on for over two hundred years.

   In many countries, the main reason people come to live in towns and cities is work. After one or two

large factories have been built in or near a town, people come to find work, and soon an industrial area

begins to grow. There is usually  a_residential_area  nearby,  too.  The families of these workers  need

schools, hospitals and shops, so many people come to live in the area to provide these services and a city grows.

     In every major city in the world, there is a business district where the big companies have their main

offices. In the United States, this area is usually in the city center downtown. It is here that you can see

many huge skyscrapers(摩天大楼)and office blocks. The people who work here often travel a long way

to work each day. Many of them live in the suburbs of the city, far away from the industrial area and the

city center. Some suburbs are very pleasant, with nice houses and big gardens. There are usually parks for children to play in and large department stores where you can buy all you need.

   But what is the future of the big cities? Will they continue to get bigger and bigger? Perhaps not. Some

major cities have actually become smaller in the last ten years, and it is quite possible that one day we will

see people moving out of the major cities and back into smaller towns and villages.

1．The underlined phrase "a residential area" means an area________.

A．where people can buy things

B．which is suitable for living in

C．where people can do business

D．which is near a city center

2．Why do people move to live in cities or towns?

A．Because they can live more comfortably there.

B．Because they like noisy life better than peaceful life.

C．Because they mainly want to find work there.

D．Because they are sure of having a better life there.

3．Which of the following statement is NOT true about the business district?

A．Big companies usually have their main offices in the business district.

B．People usually work and live in the business district.

C．A business district usually lies in the city center downtown.

D．Nearly every major city has its own business district.

4．In the United States, many people work in the center of a big city________.

A．and live there

B．but live in the suburbs of the city

C．and live in another city

D．but live in rural areas

男性，45岁，大便时突然剧烈头痛、恶心呕吐，为胃内容物，既往曾有一过性的右侧上睑下垂病史，急诊来院。

为明确定性，体检重点应是()

A．眼底

B．感觉神经系统

C．运动神经系统

D．脑膜刺激征’

E．血压