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.