建设和发展中国特色社会主义，最根本的就是要清醒认识和科学回答三大基本问题，那就是（）

If you do not know how to say something in English, you may say "__________".  [ ]

A. I don't understand.

B. Sorry, I don't know.

C. Excuse me, how do you say that in English?  

D. Let's begin now.

只能用3.5MHz线阵探头扫查甲状腺，则补救方法为

A．侧卧位联合仰卧位扫查

B．多涂耦合剂

C．在探头与甲状腺之间加一个水囊

D．提供总增益

E．使用二维伪彩，增加图像对比度

抗震设防烈度为7度的某高层办公楼，采用钢筋混凝土框架一剪力墙结构。当采用振型分解反应谱法计算时，在单向水平地震作用下某框架柱轴力标准值如下表所示： 试问，在考虑双向水平地震作用的扭转效应中，该框架柱轴力标准值（kN）应与下列何项数值最为接近（）？

A.5365

B.5410

C.6100

D.6150

In some urban centers, workaholism is so common that people do not consider it unusual．They accept the lifestyle as normal．Government workers in Washington D．C．, for example, frequently work sixty to seventy hours a week．They do this because they have to; they do it because they want to．

Workaholism can be a serious problem．Because true workaholics would rather work than do anything else, they probably don't know

how to relax; that is, they might not enjoy movies, sports, or other

types of entertainment．Most of all, they hate to sit and do nothing．The lives of workaholics are usually stressful, and this tension and worry can cause health problems such as heart attacks or stomach ulcers．In addition, typical workaholics don't pay much attention to their

families．They spend little time with their children, and their marriages may end in divorce．

Is workaholism always dangerous? Perhaps not．There are, certainly, people who work well under stress．Some studies show that many workaholics have great energy and interest in life．Their work is so pleasurable that they are actually very happy．For most workaholics, work and entertainment are the same thing．Their jobs provide them with a challenge; this keeps them busy and creative．

Why do workaholics enjoy their jobs so much? There are several advantages to work．It provides people with paychecks, and this is important．But it offers more than financial security It provides people with self-confidence; they have a feeling of satisfaction when they have produced a challenging piece of work and are able to say," I made that．" Psychologists claim that work gives people an identity; by working, they get a sense of self and individualism．In addition, most jobs provide people with a socially acceptable way to meet others．

小题1:A workaholic is a person who____．

A．tends to work long hours

B．behaves in a strange way

C．has to do many social jobs

D．holds high social positions小题2:What can be the problem of workaholism?

A．Being late．

B．Being lazy．

C．Being hopeless．

D．Being unhealthy．小题3:According to some studies, most workaholics           .

A．live a hard life

B．regard work as something enjoyable

C．like to be under stress

D．are good at both work and entertainment小题4:What are the advantages one can get by working according to the text?

a． popularity      b． satisfaction      c． good payment

d． self-confidence  e． higher positions  f． social acceptation 

A．a; b; d; e

B．b; c; e; f

C．a; c; d; f

D．b; c; d; f

在“测玻璃的折射率”实验中：

（1）为了取得较好的实验效果，下列操作正确的是______．

A、必须选用上下表面平行的玻璃砖；

B、选择的入射角应尽量小些；

C、大头针应垂直地插在纸面上；

D、大头针P₁和P₂及P₃和P₄之间的距离适当大些．

（2）甲同学在画界面时，不小心将两界面aa′和bb′间距画得比玻璃砖宽度大些，则他测得的折射率______（选填“偏大”“偏小”或“不变”）

（3）乙同学在量入射角和折射角时，由于没有量角器，在完成了光路图以后，以O点为圆心，OA为半径画圆，交OO′延长线于C点，过A点和C点作垂直法线的直线分别交于B点和D点，如图所示，若他测得AB=6cm，CD=4cm，则可求出玻璃的折射率n=______．