D. can listen to the radio broadcast while lying in bed

26. In the experiment, lessons were given____ .

A. in the night time B. after lullabies were broadcast

C. while the student was awake D. all through the twelve hours

27. Before each lesson finishes, the student has to____ .

A. get up and take breakfast B. be woken up by a loud voice

C. listen to the lesson again in sleep D. review (复习) the lesson by himself

28. The sleep study method is being tried in many countries to teach____ .

A. the English language B. grammar and vocabulary

C. a number of subjects D. foreign languages

C

A young father was visiting an old neighbor．They were standing in the old man's garden，and talking about children．The young man said，"How strict should parents be with their children？"

The old man pointed to a string（绳子）between a big strong tree and a thin young one．"Please untie（解开）that string，"he said．The young man untied it，and the young tree bent（弯）over to one side．"Now tie it again，please，"said the old man，"but first pull the string tight so that the young tree is straight again．"

The young man did so．Then the old man said，"There，it is the same with children．You must be strict with them，but sometimes you must untie the string to know how they are getting on．If they are not yet able to stand alone，you must tie the string tight again．But when you find that they are ready to stand alone，you can take the string away．"

29．The story is about　 　．

A．how to take care of young trees

B．how strict parents should be with their children

C．how the young father should get on with his old neighbor

D．how to tie and untie the string

30．The young man untied the string　 　．

A．in order to throw it away

B．so that both of the trees would grow straight

C．only to find that the thinner one bent over to one side

D．in order to let the old man teach him

31．At last the old man told the young man　 　．

A．that he should be strict with his children if they could not yet stand alone

B．that he should always be strict with his children

C．that he should be hard on them

D．that he should tie his children until they are ready to stand alone.

　　　　　　　　　　　　　D

　　NOT all memories are sweet. Some people spend all their lives trying to forget bad experiences. Violence and traffic accidents can leave people with terrible physical and emotional scars. Often they relive these experiences in nightmares.

Now American researchers think they are close to developing a pill, which will help people forget bad memories. The pill is designed to be taken immediately after a