欺诈风险

有一种可以用来计算宇宙距离的方法叫做“视差”。视差这个词的含义并不难，你伸出一个手指放在眼前大约8厘米的地方，先只用左眼看，然后用右眼看，你就会觉得手指对于远处的景物移动了位置，因为两次去看时，角度不同了。现在你将手指放远些，譬如说伸直手臂，再按上次办法来看，这次你就会觉得手指相对于背景移动了，不过移动量没有那么大。因此，手指相对于背景移动距离的大小，就可以用来确定手指到眼睛的距离了。 根据文章，对“视差”的定义表述正确的一项是( )。

A．物体与眼睛之间的距离叫视差

B．视差是眼睛所看到的物体相对背景的位移

C．视差是从不同角度看物体产生的视觉差异

D．从不同角度看物体产生的视差距叫视差

Part 4

Questions 26-45

·Read the following passage and decide which answer best fits each space.
·For questions 26-45, mark one letter A, B, C or D on the Answer Sheet.
Participation (26) high school sports is not a constitutional right. (27) , it is a privilege, paid for by taxpayers, open to students who promise to (28) certain conduct requirements on and off the field. One of these promises is to (29) from using drugs. Drug use is a serious problem among high school students. Studies show that as many as 500, 000 high school students use muscle-pumping, life-destroying substances such as steroids. Many more use illegal drugs, (30) cause discipline problems and (31) the stage for lifelong (32) .
Drug testing works to (33) and identify use. That is why drug testing is required to compete in the Olympics, the National Collegiate Athletic Association and the National Football League. (34) drug testing was instituted by these organizations, use of performance- (35) drugs has been greatly reduced. We should want (36) in schools.
Indeed, many athletes (37) testing programs, and no wonder. Without testing, athletes have to choose between drug use and a competitive disadvantage (38) the field.
Those who challenge the need for drug testing may be forgetting (39) it is like be an adolescent. Peer pressure is enormous, and one of the few effective counter-weights is the fear of being caught. More importantly, once drug use is (40) , a school can (41) to the student before he or she gets addicted or arrested.
For 25 years, public schools (42) by federal judges and civil libertarians, with results everyone can see. It is time (43) decisions on how to run public schools locally (44) officials. There is nothing unconstitutional about asking those who gain the advantages of school-sponsored athletics to contribute to the safety of other players, the integrity of the game and their own well-being. The Supreme Court should leave these programs (45) .

A．alone

B．behind

C．out

D．off

对医护人员携带的抢救危重病人所需的氧气袋应（）处理。

A、检查后即可放行。

B、凭携带人员工作证检查放行

C、交安检值班领导处理

D、凭医院证明检查放行。

一种非侵犯性诊断程序——磁共振造影(MRI)，能被用来确认冠状动脉堵塞。与一种经常使用的侵犯性诊断程序Angiograms相比，磁共振造影不会对病人产生危害。因此，为了在尝试诊断动脉堵塞时确保病人安全，磁共振造影应在所有尝试诊断冠状动脉堵塞时取代Angiograms。
下列哪项陈述如果正确，最能支持上述建议( )

A．MRI与Angiograms一样能够确认动脉堵塞
B．Angiograms能比MRI揭示更多的关于堵塞物本性的信息
C．磁共振造影主要是用来诊断冠状动脉堵塞的
D．Angiograms能被用来诊断动脉堵塞之外的情况

什么是多点驱动带式输送机，有什么作用？常用的有哪几种？