2015职称英语理工类B级考试真题
16.Perera and her team chose nonsmoking pregnant women all over America.
A.Right
B.Wrong
C.Not mentioned
参考答案：B
17.The main purpose of the research was to find out how exposure to PAHs played a role in harming the subjects'physical health.
A.Right
B.Wrong
C.Not mentioned
参考答案：B
18.Nonsmoking mothers were selected because the effect of smoking on PAHs was unclear.
A.Right
B.Wrong
C.Not mentioned
参考答案：B
19.The blood of each woman was tested once a month during pregnancy.
A.Right
B.Wrong
C.Not mentioned
参考答案：C
20.Kids with ADHD commonly fail in school.
A.Right
B.Wrong
C.Not mentioned
参考答案：C
21.The women with high levels of PAHs in their blood were more likely to have kids with ADHD.
A.Right
B.Wrong
C.Not mentioned
参考答案：A
22.Traffic and home heating were considered to be the biggest sources of PAHs for the subjects in the research.
A.Right
B.Wrong
C.Not mentioned
参考答案：A
第三部分：概括大意与完成句子
下面的短文后有2项测试任务：(1)第23—26题要求从所给的6个选项中为指定段落每段选择1个标题;(2)第27—30题要求从所给的6个选项中为每个句子确定一个最佳选项。(第23—30题，每题1分，共8分)
First Image-recognitions software
1)Dartmouth researchers and their colleagues have created an artificial intelligence software that uses photos to locate documents on the Internet with far greater accuracy than ever before.
2)The new system,witch was tested on photos and is now being applied to videos,shows for the first time that a machine learning algorithm(运算法则)for image recognition and retrieval is accurate and efficienti enough to improve large-scale document searches online.The system uses pixel(像素)data in images and potentially video—rather than just text—to locate documents.It learns to recognize the pixels associatedwith a search phrase by studying the results from text-based image search engines.The knowledge gleaned(收集)from those results can then be applied to other photos without tags or captions(图片说明)，making for more accurate document search results.
3)"Over the last 30 years,"says Associate Professor Korenzo Torresani,a co-author of the study,"the web has evolved from a small collection of mostly text documents to a modern,massive,fast-growing multimedia datastet,where nearly every page includes multiple pictures of videos.When a person looks at a Web page,he immediately get the gist(主旨)of it by looking at the pictures in it.Yet,sruprisingly,all existing popular search engine,such as Google or Bing,strip away the information contained in the photos and use exclusively the text of Wed pages to perform the document retrieval.Our study is the first to show that modern machine vision systems are accurate and efficient enough to make effective use of the information contained in image pixels to improve document search"
4)The researchers designed and tested a machine vision system—a type of artificialintelligence that allows computers to learn without being explicitly programmed—that extracts semantic(语义的)information from pixels of photos in Web pages.This informationg is used to enrich the description of the HTML page used by search engines for document retrieval.The researchers tested their approach using more than 600 search queries(查询)on a database of 50 million Wed pages.They selected the text-retrieval search engine with the best performance and modified it to make use of the additional semantic information extracted by their method from the pictures of the Web pages.They found tht this produced a 30 percent improvement in precision over the original search engine purely based on text.
23.Paragraph 1 _____
A.Popularity of the new system
B.Publication of the new discovery
C.Function of the new system
D.Artificial intelligence software created
E.Problems of the existing search engines
F.Improvementi in document retrieval
参考答案：D
24.Paragraph 2 _____
A.Popularity of the new system
B.Publication of the new discovery
C.Function of the new system
D.Artificial intelligence software created
E.Problems of the existing search engines
F.Improvementi in document retrieval
参考答案：C
25.Paragraph 3 _____
A.Popularity of the new system
B.Publication of the new discovery