将打开的数据表的全部记录删除的命令为ZAP，与之等价的命令是（）

A:DELETE ALL和PACK联用 B:PACK C:DELETE D:RECALL ALL

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Dream is a story that a person" watches” or even "takes part in" during sleep. Dream events are imaginary, but they are related to real experiences and needs in the dreamer’ s life. They seem real while they are taking place. Some dreams are pleasant, others are annoying, and still others are frightening.
Everyone dreams, but some persons never recall dreaming. Others remember only a little about a dream they had just before awakening and nothing about earlier dreams. No one recalls all his dreams.
Dreams involve little logical thought. In most dreams, the dreamer cannot control what happens to him. The story may be confusing, and things happen that would not happen in real life. People see in most dreams, but they may also hear, smell, touch, and taste in their dreams.
Most dreams occur in color. But persons who have been blind since birth do not see at all in dreams.
Dreams are a product of the sleeper’ s mind. They include events and feelings that he has experienced. Most dreams are related to events of the day before the dream and strong wishes of the dreamer. Many minor incidents of the hours before sleep appear in dreams. Few events more than two days old turn up. Deep wishes or fears - especially those held since childhood - often appear in dreams, and many dreams fulfil such wishes. Events in the sleeper’ s surrounding - a loud noise, for example, may become part of a dream, but they do not cause dreams.
Some dreams involve deep feelings that a person may not realize he has. Psychiatrists often use material from a patient’ s dreams to help the person understand himself better.
Dreaming may help maintain good learning ability, memory, and emotional adjustment. People who get plenty of sleep --but are awakened each time they begin to dream - become anxious and restless.

A:trying to help the dreamer recall his earlier dreams B:trying to make the sleeper dream logically C:studying the benefits of dreams D:helping the sleeper fulfill his dreams

They all study hard but she studies the hardest ______.

A:all B:of all C:in all D:all in all

Memory is the ability to keep track of things that have happened in the past. Memory really is learning. One needs memory to ride a bicycle. A dog needs to remember if it is to come when called.
Memory is said to be stored in the brain as a "memory trace (记忆痕) ". What makes up this trace is not known. Some scientists believe that certain chemical substances may carry certain memories. For example, one substance, when given to rats, causes them to fear the dark.
Other research into memory has to do with how the brain works. Psychologists use three means to find out bow a person remembers. For example, give a person a grocery list. Let the person memorize the list, then put it away. The most natural way to find out how much a person remembers of the grocery list is to ask what he or she remembers. This is called the method of recall. Another method is called recognition. Give the person another grocery list. Ask him or her to choose items on the first list from the items that are on only the second list. Often a person will be able to recognize things that he or she cannot recall. A third method of finding how much a person remembers is called relearning. Here the person is asked to read over the first list. The person will probably learn the list the second time faster than he did the first time. The difference in the time it takes to relearn the list is thought of as measure of how much a person has remembered.
One way of remembering something is to repeat it many times. Interest is very important. Boring lists of facts are much more difficult to remember than something that we understand and are interested in. Motivation, or wanting to do something, is also important. Motivation is linked with reward. For example, a hungry animal quickly learns how to do something if that action gets the animal food. In humans, wanting to learn is often motivation. The praise of a teacher or the knowledge that an answer is correct is rewarding.

A:recognition B:recall C:memorization D:relearning

执行如下命令：
USE 职工
DELETE FOR 性别=“女”
若要去除所有删除记录的标记，应该使用的命令是( )。

A:RECALL B:RECALL ALL C:RELEASE D:REALSE ALL

在下列命令中，不改变数据库记录指针的命令是( )。

A:LIST B:DISPALY C:RECALL D:RECALL ALL

执行如下命令： USE 职工 DELETE FOR 性别=“女” 若要去除所有删除记录的标记，应该使用的命令是( )。

A:RECALL B:RECALL ALL C:RELEASE D:REALSE ALL

在下列命令中，不改变数据库记录指针的命令是( )。

A:LIST B:DISPALY C:RECALL D:RECALL ALL