问题 单项选择题 A1/A2型题

根据疾病诊断的需要,灵活选用窗宽、窗位。颅脑CT图像常用脑窗摄影。窗宽80~100HU,窗位35HU左右。颅底、内听道病变;颅脑外伤;颅骨病变,或颅内病变侵犯颅骨,必须加摄骨窗。骨窗的窗宽1000~1400HU,窗位300~500HU。耳鸣及疑桥小脑角区病变者,应利用调节窗口技术,以观察内听道有无扩大,并根据需要对局部进行放大。头皮下软组织病变,用软组织窗摄影:窗宽300~400HU,窗位35~45HU。根据不同的部位和病变灵活选用窗宽和窗位。若病变和周围组织密度接近时,可适当调窄窗宽;若伪影较多或需观察局部组织的丰富层次,可调低窗位,并适当调宽窗宽。鞍区CT图像常用软组织窗和骨窗,软组织窗窗宽350~400HU,窗位35~40HU。

下面对颅脑CT后处理技术应用正确的是()

A.颅脑CT图像常用软组织窗摄影

B.观察脑时用窗宽80~100HU,窗位35HU左右

C.骨窗的窗宽1500~2000HU,窗位300~500HU

D.观察软组织时用窗宽400~500HU,窗位30~60HU

E.疑桥小脑角区病变者用窗宽80~100HU,窗位35HU左右

答案

参考答案:B

阅读理解

The Couch Surfing network is an online community stretching across the globe with over one and a half million members. The basic concept is to provide a platform for travelers to contact people who are willing to put them up free of charge. Travelers connect with potential hosts online and, if they like each other, exchange details to make farther arrangements.

  Basil is one traveler from Switzerland who is currently couch surfing with a Chinese host in Beijing. "I thought staying in hostel is nice but you mostly meet foreigners and speak English. If you use Couch Surfing you have chance to meet people living here and really get a chance to know the life of the place you visit. " Basil was speaking during a regular meeting of Beijing network of Couch Surfing with a membership of almost 2,000.

  Although some people may have concerns about meeting complete strangers and giving them full access to your house, Beijing group member Fred Sharp from California says that the Couch Surfing community is one that generally attracts trustworthy people.

  "I have never had a problem with guests. I'd say that this Couch Surfing community worldwide is a fairly trustworthy community like I say, always be cautious, make sure that you read everyone's profile that you're considering hosting, and if it doesn't feel right just say' no', it's OK. "

  Originally launched in the US as a non-profit organization in 2004, Couch Surfing is growing fast across the world. China is no exception with around 30,000 members and hundreds more signing up each week. One of them is Beijing resident Hai Yan who joined in November 2009. She says the first time she hosted a guest was a very positive experience. "My first guest was from Italy. He was very kind and helpful. He bought me a present from Italy, a handbag. It's a famous brand!"

  As the organization grows from strength to strength, hotel owners across the world will be watching very closely and possibly thinking twice about raising their prices too high.

小题1:The Couch Surfing network is intended to __________ .

A.offer travelers convenience to find suitable hosts for free accommodations

B.provide people with a platform to contact each other

C.find potential hosts who want to supply travelers with couches

D.give reliable information about hotels小题2:According to Fred Sharp, ______________.

A.couch surfers can fully rely on Couch Surfing community

B.Couch Surfing community enables you to meet different people

C.Couch Surfing community is trusted by all couch surfers

D.Hosts may form a judgment on couch surfers and make a final decision小题3:We can infer from the passage that ________________.

A.Couch Surfing has a long history

B.Hai Yan is satisfied with her host

C.Couch Surfing is getting popular in China

D.Basil works at the Beijing Network小题4:The last paragraph suggests that hotels will ___________ .

A.be replaced by the organization

B.probably not charge too much

C.not consider raising their prices

D.show no concern about the organization

多项选择题