1. Shortages of flue vaccine show that _______。
　　[ A ] America relies too much on foreign suppliers
　　[ B ] the demand of flu vaccines is high this year
　　[ C ] quality problem is a serious problem in flu vaccine production
　　[ D ] the supply of flu vaccines is rather weak and America has no back-up measures to make it up
　　2. The word "cleared" ( Line 4, Paragraph 3 ) might mean _______。
　　[ A ] permitted
　　[ B ] removed
　　[ C ] proved
　　[ D ] produced
　　3. Private companies have little interest in producing flu vaccines because of _______。
　　[ A ] complicated process, high cost, low profit and high risk
　　[ B ] shortages of fertilized chicken eggs
　　[ C ] difficulty in growing live virus
　　[ D ] fast changing of flu virus
　　4. From the last paragraph we can infer that _______。
　　[ A ] the government hopes to solve the problem by way of volunteer restrictions
　　[ B ] more than 47 million Americans who are qualified to get flu vaccine shots can not get them this year
　　[ C ] America has to deal with a limited supply of flu vaccines this year
　　[ D ] normally only a small percentage of American population gets flu vaccine shots each year
　　5. According to the passage, which of the following is TRUE?
　　[ A ] All Americans are persuaded not to get vaccinated this year.
　　[ B ] The big problem in innovating flu vaccine producing technique is how to grow virus in a new way.
　　[ C] More flu vaccines can not be produced in a short time because private companies refuse to produce more.
　　[ D ] Flu vaccines are easier than most vaccines to produce through cell cultures.