We were all greatly impressed by ____ houses were built there.

Some adults require little sleep; others need eight to ten hours in every twenty-four.Infants sleep sixteen to eighteen hours daily and,as they grow older,the amount gradually diminishes.Young students may need twelve hours; university students may need ten.A worker with a physically demanding job may also need ten,whereas an executive worker under great pressure may manage on six to eight.Many famous people are reputed to have required little sleep.Napoleon,Thomas Edison and Charles Darwin apparently averaged only four to six hours a night.

Whatever your individual need,you can be sure that by the age of thirty you will have slept for a total of more than twelve years.By that age you will also have developed a sleep routine:a favorite hour,a favorite bed,a favorite position,and a formula you need to follow in order to rest comfortably.Investigators have tried to find out how long a person can go without sleep.Several people have reached more than 115 hours ?nearly five days,whereas animals kept awake for from five to eight days have died of exhaustion.The limit for human beings is probably about a week.

1.According to the passage,the sleeping routine will be built at the age of（）.

A、10

B、20

C、30

D、40

2.The amount of sleep required（）.

A、varies greatly from individual to individual

B、depends on an individual's age

C、relates to an individual's occupation

D、all of the above.

3.From the amount of sleep Napoleon,Edison and Darwin required,we can infer that（）.

A、they were famous great men

B、they were executive workers

C、they were intelligent people

D、they were involved in mentally demanding work

4.From animal experiments,we can conclude that the final result of the lack of sleep is probably （）.

A、mental illness

B、mental breakdown

C、susceptibility to illness

D、death

5.The writer implies that（）.

A、sleep is important for good mental and physical health

B、a light sleep is as restful as a deep sleep

C、memory is improved during sleep

D、sleep is relatively unimportant for human beings

Sporting activities are essentially modified forms of hunting behaviour. Viewed biologically, the modern footballer is in reality a member of a hunting group. His killing weapon has turned into a harmless football and his prey (猎物) into a goal mouth. If his aim is accurate and he scores a goal, he enjoys the hunter’s triumph of killing his prey.

To understand how this transformation has taken place we must briefly look back at our forefathers. They spent over a million years evolving (进化) as cooperative hunters. Their very survival depended on success in the hunting-field. Under this pressure their whole way of life, even their bodies, became greatly changed. They became chasers, runners, jumpers, aimers, throwers and prey-killers. They cooperated as skillful male-group attackers.

Then about ten thousand years ago, after this immensely long period of hunting their food, they became farmers. Their improved intelligence, so vital to their old hunting life, was put to a new use--that of controlling and domesticating their prey. The hunt became suddenly out of date. The food was there on the farms, awaiting their needs. The risks and uncertainties of the hunt were no longer essential for survival.

The skills and thirst for hunting remained, however, and demanded new outlets. Hunting for sport replaced hunting for necessity. This new activity involved all the original hunting sequences but the aim of the operation was no longer to avoid starvation. Instead the sportsmen set off to test their skill against prey that were no longer essential to their survival. To be sure, the kill may have been eaten but there were other much simpler ways of obtaining a meaty meal.

The author believes that sporting activities （）.