问题 单项选择题

采用标准的BGO(锗酸铋)晶体进行正电子发射断层显像时,探头的状态是

A.旋转360°
B.探头不需要旋转
C.旋转180°
D.旋转45°
E.旋转90°

答案

参考答案:B

解析:PET的探头部分是由众多的探测器呈环形、多角形或相对形排列而成,目前多采用BGO晶体,采集信息时,探头自身不需要旋转。

阅读理解

Dog owners now have a little help understanding their furry friends.A new device(装置) called Bow-Lingual “translates” dog barks into English, Korean or Japanese.Bow-Lingual Japanese inventors spent much time and money analyzing dog barks.They found that dog noises can be broken down into six different emotions: happiness, sadness, frustration, anger, assertion and desire.

Part of the Bow-Lingual device hangs on the dog’s collar.The other part is a handle-held unit for the owner.When the dog barks, the unit displays translated phrases.

Some people have scoffed at Bow-Lingual.“Who would pay $120 to read a dog’s mind?” they ask.

But those who have purchased(购买) Bow-Lingual praise the device.Pet owner Keiko Egawa, of Japan, says it helps her sympathize(同情) with her dog Harry.“Before we go to the park, he always says he wants to play,” says Egawa, “and after a walk, he always says he is hungry.”

Bow-Lingual is not yet available(可用的) in Chinese.So you’d better keep studying Studio Classroom, or soon your dog may know more English than you do!

小题1:This passage is mainly talking about _____.

A.Bow-Lingual’s inventors

B.dog barks and their different emotions

C.talking dogs

D.a little help for dog owners小题2:Which of the following sentences is TRUE according to the passage?

A.Dog owners now can understand their dogs better.

B.Bow-Lingual enables dogs to talk in English, Korean or Japanese.

C.People who have used Bow-Lingual say it helps them better understand their dogs.

D.More and more Chinese dog owners would keep studying Studio Classroom in order to know more English than their dogs.小题3:What does “scoffed at” mean in the fourth paragraph?

A.Shouted at.

B.Questioned about.

C.Laughed at.

D.Doubted about.小题4:The writer of this passage is most likely to be _____.

A.a reporter

B.a dog owner

C.an advertiser

D.an expert on dog barks

单项选择题