Street sellers, particularly in developing countries, supply large amounts of food _____(1) people on low incomes. This sector (部门) also employs some 6-25% of the work force, mainly women, in developing countries, and provides markets for agricultural and other produce. In many countries, _____(2), the authorities are not willing to recognize it as a formal sector of the food _____(3) system; they may ignore it in food control programs or even try to put an end to _____(4).
There are two possible contaminants (污染物): pathogenic (病原) micro-organisms (微生物) _____(5) harmful chemicals. As _____(6) as micro-organisms are concerned, there is apparently no convincing evidence that street foods are more involved in the transmission of infection than foods obtained in, e.g. hotels. Studies in Egypt and elsewhere have found street foods to compare not unfavorably with hotel _____(7) in respect of contamination with micro-organisms - some street foods were found to be contaminated with pathogens (病原菌), but so were foods from four, and five-star _____(8) in the same area.
Harmful chemicals have been found in street foods, and food exposed for sale on roadsides, may become _____(9) by lead from vehicle exhausts.
Health dangers may arise from: purchase of raw materials of _____(10) quality; improper storage, processing, and cooking, leading to reuse of water; limited piped drinking-water; lack of refrigeration (冷藏); unsatisfactory waste-disposal facilities; and personal cleanliness医学全在线www.med126.com.
答案：1. A 2. B 3. C 4. D 5. A 6. B 7. D 8. A 9. C 10. D