中国移动2017中移铁通校园招聘考试英语试题三（附解析）

Questions 11 to 15 are based on the following passage:
Prolonging human life has also increased the dependency load. In all societies, people who are disabled or too young or too old to work are dependent on the rest of society to provide for them. In hunting and gathering cultures, old people who could not keep up might be left behind to die. In times of famine, infants might be allowed to die because they could not survive if their parents starved, whereas if the parents survived they could have another child. In most contemporary (当代的) societies, people feel a moral obligation to keep people alive whether they can work or not. We have a great many people today who live past the age at which they want to work or are able to work; we also have rules which require people to retire at a certain age. Unless these people were able to save money for their retirement, somebody else must support them. In the United States many retired people live on social security checks which are so little that they must live in near poverty. Older people have more illness than young or middle-aged people; unless they have wealth or private or government insurance, they must often go on welfare if they have a serious illness.
11. What was the cause to the population growth according to the passage?
B. advance in medical care
D. the decrease of death rate
A. infants may be left to die when there isn't enough food to go around
C. people are required to retire at a certain age
13. What does the word "senile" in the first line of the last paragraph mean?
C. disabled                             D. capricious
A. suspicious          B. optimistic        C. neutral         D. critical