问题 单项选择题

美国科学家近日研制出一种摄像机,它可以把患者静脉的绿色视频图像投射在皮肤上,这一投影与静脉的实际位置基本一致。这样可大大减少因医护人员静脉注射不熟练给患者带来的疼痛。
这台名为“静脉对比度增强仪”的装置用一架近红外线摄像机实时捕捉患者静脉视频图像,围绕摄像机镜头的一排近红外线发光二极管。以740纳米的波长照亮皮肤,这种波长能被血液吸收,被血管周围组织分散。摄像机拍摄的图像被输入个人电脑并用软件处理,该软件将图像实时映射在一个明亮的绿色背景上。并增强静脉和周围组织之间的对比度,个人电脑然后将图像输入到一架投影机,投影机又将图像投射到皮肤上。
为防止出错,这种装置还特别安装了一种叫“热镜”的装置。“热镜”在可见光下是透明的,可以反射红外线波长。视频投影机和摄像机被设定在相互呈90度角面对镜子的位置上,而镜子相对视频投影机和摄像机呈45度角。经校准后,可以保证一条静脉的投影距离其正确位置的误差始终不超过0.06毫米。

投影机投射到皮肤上的图像是( )。

A.该皮肤下的静脉及其周围组织

B.电脑制作的彩色动画图像

C.电脑制作的绿色动画图像

D.摄像机拍摄的纳米图像

答案

参考答案:A

解析: 从第二段中“患者静脉视频图像”,可知答案是A。

完形填空

Life is not easy, so I’d like to say,“When anything happens, believe in yourself.”When I was 14,  I was__1__ nervous to talk to anyone. My classmates often laughed at me. I was sad but could do nothing. Later__2_ happened. It affected my life. It was an English speech contest. My mother asked me to take part in it. What a/an__3 idea! It meant I had to___4__ in front of all the teachers and students of my school!

“Come on, boy. Believe in yourself. You are sure to win.” Then mother and I talked about many different topics. At last I chose the topic” Believe in yourself”. I tried my best to _5_ all the speech and practised it over 100 times.  __6__my mother’s great help, I did well in the contest. I could hardly (几乎不) believe my _7_ when the news came —— I won the first place. I heard the   8 from the teachers and students. Those__9__looked down on (瞧不起)me before, but they now all said congratulations to me. My mother hugged (拥抱)me and cried excitedly.

Since then, everything changed for me. When I do anything, I try to tell  10 to be sure and I will find myself. This is true not only for a person but also for a country.

小题1:A. so            B. too          C. very

小题2:A. something     B. nothing      C. anything

小题3:A. interesting   B. exciting     C. terrible

小题4:A. say           B. speak        C. tell

小题5:A. remember      B. see          C. hear

小题6:A. At            B. To           C. With

小题7:A. ears          B. eyes         C. result(结果)

小题8:A. cheers        B. wishes       C. thanks

小题9:A. boys          B. girls        C. classmates

小题10:A. my mother     B. him          C. myself

多项选择题