[填空题]On the upper slopes of the Himalayas, the human immune system does not function well, ______ (因此伤口、感染不易治疗).

[填空题]On the upper slopes of the Himalayas, the human immune system does not function well, ______ (因此伤口、感染不易治疗).

[单项选择]Human memories are quite complicated beyond our imagination. We remember some things better than other things. For example, November 22, 1963 is etched (铭刻) into the minds of nearly every English-speaking person over 40. It was, of course, the day that President Kennedy was shot. The fact that so many people can remember that moment demonstrates what a world-shattering one it was. But in the long run, it may be that what it demonstrates about the workings of the human train is more important. After all, why should we remember what we were doing when we heard of the assassination We take it for granted that our memories work this way.
Some people have the ability to reproduce things perfectly through what is known as an eidetic memory. These are the people who can glance at a newspaper and retain a ’snapshot’ memory of it. This sort of memory is quite different from the imprint that most of us would make. Try closing your eyes and bringing to mind a scene you know well—the pattern
A. It is difficult to remember your actions on a day a long time ago.
B. They weren’t affected personally by the assassination.
C. It was such an important event for the world as a whole.
D. They probably weren’t doing anything unusual that day.

[单项选择]

Prolonging Human Life
Prolonging human life has increased the size of the human population. Many people alive today would have died of childhood diseases if they had been born 100 years ago. Because more people live longer, there are more people around at any given time. In fact, it is a decrease in death rates, not an increase in birthrates, that has led to the population explosion.
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 societies, people feel a moral obligation to keep people alive whether they can work or not. We have
A. an increase in birthrates.
B. the industrial development.
C. a decrease in death rates.
D. cultural advances.

[单项选择]
Since the dawn of human ingenuity, people have devised ever more cunning tools to cope with work that is dangerous, boring, burdensome, or just plain nasty. That compulsion has resulted in robotics—the science of conferring various human capabilities on machines. And if scientists have yet to create the mechanical version of science fiction, they have begun to come close.
As a result, the modern world is increasingly populated by intelligent gizmos whose presence we barely notice but whose universal existence has removed much human labor. Our factories hum to the rhythm of robot assembly arms. Our banking is done at automated teller terminals that thank us with mechanical politeness for the transaction. Our subway trains are controlled by tireless robo-drivers. And thanks to the continual miniaturization of electronics and micro-mechanics, there are already robot systems that can perform some kinds of brain and bo
A. the use of machines to produce science fiction
B. the wide use of machines in manufacturing industry
C. the invention of tools for difficult and dangerous work
D. the elite’s cunning tackling of dangerous and boring work

[单项选择]Prolonging Human Life
Prolonging human life has increased the size of the human population. Many people alive today would have died of childhood diseases if they had been born 100 years ago. Because more people live longer, there are more people around at any given time. In fact, it is a decrease in death rates, not an increase in birthrates, that has led to the population explosion.
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 societies, people feel a moral obligation to keep people alive whether they can work or not. We have a great man
A. Sympathetic.
B. Unfriendly.
C. Optimistic.
D. Critical.