河北省武强县2017高考英语阅读理解一轮限时训练题（1）及答案

　　【陕西省2017五校联考】D

　　阅读下列四篇短文, 从每小题后所给的A、B、C、D四个选项中, 选出最佳选项, 并在答题卡上将该选项涂黑。Food picked up just a few seconds after being dropped is less likely to contain bacteria than if it is left for longer periods of time, according to the findings of research carried out at Aston University’s School of Life and Health Sciences. The findings suggest there may be some scientific basis to the “5 second rule” – the belief about it being fine to eat food that has only had contact with the floor for five seconds or less. Although people have long followed the 5 second rule, until now it was unclear whether it actually helped.

　　The study, undertaken by final year Biology students and led by Anthony Hilton, Professor of Microbiology at Aston University, monitored the transfer of the common bacteria from a variety of indoor flooring types (carpet, cement floor etc.) to toast, pasta, a biscuit and a sticky sweet when contact was made from 3 to 30 seconds. The results showed that: Time is a significant factor in the transfer of bacteria from a floor surface to a piece of food; and the type of flooring the food has been dropped on has an effect, with bacteria least likely to transfer from carpeted surfaces and most likely to transfer from cement flooring surfaces to moist(湿的 foods making contact for more than 5 seconds. Professor Hilton said: “Consuming food dropped on the floor still carries an infection risk as it very much depends on which bacteria are present on the floor at the time.”

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