2017英语等级考试pets5级阅读理解每日练习七
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.
