【題目】A new smart phone system under development can locate you even when you’re inside a building, which GPS can't do. While the concept sounds powerful, it’s not yet clear how practical it might be.

The set-up, called SurroundSense, sends information from cameras and microphones—gear in the latest smart phones—to a server that produces a fingerprint of the location.

“You can’t tell much from any of the measurements individually, but when combined, the optical (光學(xué)的), acoustic (聲學(xué)的) and motion information creates a unique fingerprint of the space,” said Ionut Constandache, a student in computer science.

The system distinguishes between two indoor spaces in this manner: It knows that a bar is likely to be dark and noisy and people move little, sit a lot, whereas a department store will be brightly lit, contain vibrant colors, and will see a lot of people moving up and down passages. The more the system is used, the more it learns about specific places.

More work is needed before the set-up would be ready for prime time, however. For now, it can’t work if a person’s cellphone is in a handbag or otherwise unable to employ the camera. Finally it would be best served if paired with phones that were worn on the wrist or hung around the neck. Batteries, too, are a problem.

Students on the research team went out across Durham, North Carolina, with their cellphones collecting data in different types of businesses. The students mirrored the actions of the selected customers so that they would not prejudice the measurements.

“We went to 51 different stores and found that SurroundSense achieved an average accuracy (精確性) of about 87 percent," Constandache said.

“As the system collects and analyzes more and more information about a particular site, the fingerprint becomes more precise,” said Romit Roy Choudhury, professor of computer engineering. “Not only is the ambience different at different locations, but also can be different at different time at the same location.”

【1】We can infer from the first paragraph that GPS .

A. can find you wherever you are

B. can make too much loud noise

C. can only find outside things

D. isn’t really practical yet

【2】Why did students mirror the actions of the selected customers?

A. To get a reasonable result.

B. To collect data in different ways.

C. To receive information about a particular site.

D. To learn more about specific places.

【3】The underlined word “ambience” in the last paragraph may mean .

A. the fingerprint of the location

B. the character of a place

C. the existence of people

D. the area of store

【4】The main idea of the passage is about .

A. comparing GPS with a smart cellphone

B. the development of cellphones

C. a cellphone knowing where you are

D. what kind of future cellphones face

【答案】

【1】C

【2】A

【3】B

【4】C

【解析】

試題分析：文章介紹了一種新的智能手機(jī)定位系統(tǒng)。這個(gè)系統(tǒng)甚至能定位到建筑物內(nèi)的人的位置。這看起來像是一個(gè)瘋狂的概念，因?yàn)樗膶?shí)用性還未得到驗(yàn)證。

【1】推理判斷題。根據(jù)第一段“can locate you even when you’re inside a building, which GPS can't do”可知，一個(gè)新的手機(jī)系統(tǒng)能夠定位大樓內(nèi)的人的位置，這是GPS辦不到的，由此推知，GPS只能定位露天的地方，故選C。

【2】細(xì)節(jié)理解題。根據(jù)倒數(shù)第三段“The students mirrored the actions of the selected customers so that they would not prejudice the measurements.”可知，試驗(yàn)中，學(xué)生模仿被選中的消費(fèi)者的動(dòng)作，是為了減少測量的偏差，故選A。

【3】猜測詞義題。根據(jù)“...more information about a particular site, the fingerprint becomes more precise”可知，這里說的是收集并分析同一地點(diǎn)的信息越多，指紋識(shí)別就會(huì)變得越精確，不同地點(diǎn)有不同的環(huán)境，同一地點(diǎn)在不同的時(shí)間，它的周圍環(huán)境也有可能不同，故選B。

【4】主旨大意題。根據(jù)第一段“ A new smart phone system under development can locate you even when you’re inside a building”和后面幾段的首句“The set-up, called SurroundSense, ...The system distinguishes between two indoor spaces in this manner ...More work is needed before the set-up would be ready for prime time”可知，文章主要介紹了 一個(gè)新的手機(jī)定位系統(tǒng)，故選C。

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