Europe’s deadly outbreak of a rare form of E. coli bacteria (大腸桿菌) has brought new attention to food safety issues. One of the problems when people get sick from food is that the simplest question is often difficult or even impossible to answer. Just what did the people eat that made them sick?
Of course, one way to avoid these medical mysteries is to keep dangerous organisms out of the food supply. This is easier said than done, but scientists keep looking for new ways.
Scientists in the United States have developed an experimental system that uses a high-tech optical scanner. The system is designed to identify the presence of contaminants(致污物) like soil or animal waste on fresh produce. These can be sources of E. coli. E. coli bacteria naturally live in the intestines(腸) of humans and many animals. Most kinds of E. coli are harmless but some can make people sick.
The new scanner can also show damage and imperfections that might make the produce unappealing to shoppers.
Scientists designed the system at a Department of Agriculture research center in Beltsville, Maryland. Moon Kim of the Agricultural Research Service led the team.
MOON KIM: “We were requested, we were asked, to develop a method to detect contamination in produce. So we started with the apple as the model sample.”
The scanner uses a high-speed camera placed over the conveyer belt that moves the produce along. As the apples move along the belt, the scanner captures images of each piece of fruit.
Moon Kim says the team hopes the system will be available before long.
MOON KIM: “We are targeting for development in commercial plants for the next several years.”
The scanner can direct a sorting machine to separate the bad apples from the good ones. The system is currently able to show the surface of only half the apple as it speeds by. The inventers hope to improve the process so it can show the whole surface.
【小題1】What is the main topic of the text?

A．Bacteria. B．A high-tech scanner.C．A camera D．Food safety.
【小題2】E. coli bacteria ______.
A．broke out all over the world B．comes from soil or animal waste
C．is extremely harmful to health D．does not cause illness
【小題3】The high-tech scanner ______.
A．can help to sort out different fruits
B．make the produce appeal to shoppers
C．can only capture images of the whole apple
D．can identify the presence of contaminants
【小題4】What can be inferred from the text?
A．The scanner needs to be improved.
B．The scanner will be available in the next several years.
C．Moon Kim is unwilling to develop the scanner.
D．The scanner is connected to a sorting machine.


【小題1】B
【小題2】B
【小題3】D
【小題4】A

解析試題分析：歐洲一種罕見大腸桿菌的致命爆發(fā)引發(fā)了人們對食品安全問題的新的關(guān)注。在人們因?yàn)槭称分虏〉囊幌盗袉栴}中，有一個(gè)最簡單的問題卻常常難于甚至無法回答，這就是，他們吃了什么導(dǎo)致生�。棵绹茖W(xué)家開發(fā)了一種使用高科技光學(xué)掃描裝置的實(shí)驗(yàn)性系統(tǒng)。這種檢測系統(tǒng)針對于食品包裝上市環(huán)節(jié)。希望這個(gè)新科技能真的成為食品安全的福音。
【小題1】主旨大意題。綜觀全文可知本文主要介紹了這種高科技的掃描儀，故選B。
【小題2】細(xì)節(jié)理解題。根據(jù)contaminants(致污物) like soil or animal waste on fresh produce. 故選B。
【小題3】細(xì)節(jié)理解題。根據(jù)The system is designed to identify the presence of contaminants(致污物) like soil or animal waste on fresh produce.該系統(tǒng)用于識(shí)別新鮮農(nóng)產(chǎn)品表面上的土壤或動(dòng)物糞便等污染物，故選D。
【小題4】推理判斷題。根據(jù)The system is currently able to show the surface of only half the apple as it speeds by. The inventers hope to improve the process so it can show the whole surface.這種掃描儀有待于提高，故選A。
考點(diǎn)：健康保健類短文閱讀。
點(diǎn)評：主旨大意題主要是測試考生對一篇文章或一段文字的深層理解程度及在速讀中準(zhǔn)確把握文章大意的能力，一般針對某一語段或某一語篇主題標(biāo)題或目的設(shè)題。做這類題，關(guān)鍵在于抓住文章要旨。

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