2011年12月英语四级全真预测试卷及答案(3)-3

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Directions: There are 20 blanks in the following passage. For each blank there are four choices marked A), B), C) and D). You should choose the ONE that best fits into the passage.

Everyone knows hand washing is important. But a new study shows how washing your hands 67 , and at the right time, can have a big impact on your family’s risk of getting sick.

Most studies on hand washing focus on 68 and food service workers. But this month’s American Journal of Infection Control focuses on washing hands at 69 as a way to stop infections from 70 . Several studies show hands are the single most important 71 route for all types of infections.

Even though most people know to wash their hands after using the toilet or handling a diaper (尿布), studies 72 many people are still ending up with germs on their hands.

One study looked in homes of 73 recently vaccinated against polio (脊髓灰质炎). After vaccination, the virus is

74 to be shed in the baby’s feces (粪便). Researchers found the virus on 13 percent of bathroom, living room and kitchen surfaces. 75 the virus from the vaccine didn’t pose a health risk, feces-borne viruses can 76 through the home.

Doorknobs and toilet flush handles are key 77 of germ transmission in the home. That’s why people should focus on cleaning such surfaces 78 and always wash their hands after touching them. In one study, a 79 touched a door handle contaminated with a virus. He then shook hands 80 other volunteers, and spread the virus to six people.

The study authors note that the timing of hand washing is key. It’s 81 to wash hands after using the toilet, before eating or handling food. Other crucial times for hand washing are after 82 a diaper or cleaning up after a pet, or after touching garbage cans, dish rags and utensils that may have come 83 contact with raw food.

While it may be hard to 84 that something as simple as regular hand washing can make a difference in your family’s health, consider what happened during the 2003 outbreak of SARS. The outbreak 85 extensive public and community health measures, including regular hand washing. Not only was the SARS outbreak contained, 86 other cases of illnesses dropped sharply.

67. A) occasionally B) often C) sometimes D) repeatedly

68. A) chemical B) physical C) medical D) mental

69. A) home B) clinics C) hospitals D) school

70. A) living B) spreading C) surviving D) going

71. A) transmit B) transfer C) transferring D) transmission

72. A) claim B) agree C) suggest D) object

73. A) parents B) teachers C) adults D) infants

74. A) known B) said C) moved D) added

75. A) When B) While C) Why D) Which