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.