Radars extensively for mapping geological structures and features. （使用use的适当时态和语态）

You use a recovery catalog for maintaining your database backups.You execute the following command:$rman TARGET / CATALOG rman / cat@catdbRMAN >BACKUP VALIDATE DATABASE ARCHIVELOG ALL;Which two statements are true?（）

A. Corrupted blocks, if any, are repaired.

B. Checks are performed for physical corruptions.

C. Checks are performed for logical corruptions.

D. Checks are performed to confirm whether all database files exist in correct locations

E. Backup sets containing both data files and archive logs are created.

According to the passage, how do stores and companies use the psychology of money spending to promote business?

A．They stress the practical value of the things they sell.

B．They try to improve the quality of the things they sell.

C．They stress the non-practical value of the things they sell.

D．They try to diversify the functions of the things they sell.

Scientists now tend to agree that the noise level for potential hearing loss begins at about 70 decibels. Some of them are very concerned because normal daily life often exposes people to noise levels of about 70 decibels even inside their homes. Cities have always been noisy, but noise is now spreading to areas that were quiet just a few years ago. Clearly, something must be done or noise will seriously and permanently maim the population. Fortunately, the knowledge and methods to control noise already exist. As a matter of fact, this is one instance where the knowledge of control methods exceeds the knowledge about the effects on human life and on the environment. There are two common means for control. The first is reducing noise at its source, and the second is changing the sound path by distance or by shielding. The second approach is being used more often today as people become more aware of the danger of noise. New building codes require better sound insulation in homes and apartments. More and more towns are passing zoning ordinances that try to segregate noisy factories or airports from residential areas. Sound-absorbent materials and construction designed to block sound paths are slowly coming into use in offices and homes. New highways are being built to redirect traffic noise up and away from nearby areas. Aircraft are increasingly being required to use reduced-power flights around airports. There are many examples of available noise control methods that are not being used. More flexible building codes would permits the use of quieter kinds of plumbing pipes. Sound-absorbent materials can reduce the noise of motors and engines. Power generators can be quieted with baffles, exhaust silencers, and sound absorbers. Truck tires can be made with quieter treads. In many cases, the most of building quieter machines is the same or only slightly higher than that of the current noisy ones. Even though the new jumbo jets, for example, are quieter than the older ones, yet they are more powerful and carry twice as many passengers. All of these methods are only partial measures as noisy levels continue to rise. Most specialists in the field agree that much of the solution must come from eliminating some of the noise at its source, therefore saving through prevention the large costs of hearing loss.

The noise level for possible hearing loss begins at about______.

A．30 decibels

B．70 decibels

C．100 decibels

D．none of the above

At the beginning of last year, Riso Company purchased a production line for $80,000 for making toys, which are their star products. According to previous experience, Riso Company estimated that the production line was able to produce a maximum of 500,000 toys and that the production line could be used for eight years with no residual value. At the end of last year, the company actually produced 30,000 toys. Assume Riso Company uses units-of-production depreciation method to measure its fixed assets, the depreciation expense for the line in the last year was:

A.$4,800.

B.$8,000.

C.$16,000.

听力原文： Alexander Fleming was bom on August 6th, 1881 on Darvel, Scotland. He was one of the eight children in the family. As a boy he showed a strong interest in nature.

Just before his 14th birthday he went to London to live with an older brother, Dr. Thomas Fleming. At 16 he went to work as a clerk for a shipping company.

When Fleming was twenty, an uncle died and left him a small sum of money. Determined to use the money wisely, he asked his brother's advice. Dr. Flemning suggested that he take an examination for medical college. He took the exam, and he got the highest score. He then began to study at St. Mary's Hospital in London.

When he completed his medical training, Fleming did not join his brother's practice as he had earlier intended. He decided to spend the rest of his life as a biologist.

It was in the fall of 1928 that Fleming discovered penicillin, the chemical produced by a mold called Penicillum. But it was two years before anyone attempted to produce pure penicillin in quantity. This was achieved by two other scientists, Howard Florey and Ernst Chain, during World War Ⅱ , in time to save the lives of thousands of wounded soldiers.

In 1945, he, Florey and Chain received the Nobel Prize for medicine.

Alexander Fleming died at the age of 71, on March 11th, 1955.

(33)

A．In Britain.

B．In the United States.

C．In Canada.

D．In France.

Linguists have found that sign languages and spoken languages share many features. Like spoken languages, which use units of sounds to produce words, sign languages use units of form. These-units are composed of four basic hand forms: hand shape, such as an open hand or closed fist; hand location, such as on the middle of the forehead or in front of the chest; hand movement, such as upward or downward; and hand orientation, such as the palm facing up or out.

In spoken languages units of sound combine to make meaning. Separately, b, e, and t have no meaning. However, together they form. the word bet. Sign languages contain units of form. that by themselves hold no meaning, but when combined create a word. Spoken languages and sign languages differ in the way these units combine to make words, however. In spoken languages units of sound and meaning are combined sequentially. In sign languages, units of form. and meaning are typically combined simultaneously.

In American Sign Language (ASL) signs follow a certain order, just as words do in spoken English. However, in ASL one sign can express meaning that would necessitate the use of several words in speech. For example, the words in the statement "! stared at it for a long time" each contain a unit of meaning. In ASL, this same sentence would be expressed as a single sign. The signer forms "look at" by making a V under the eyes with the first and middle fingers of the right hand. The hand moves out toward the object being looked at, repeatedly tracing an oval to indicate "over a long time". To express the adverb "intently" the signer squints the eyes and purses the lips. (To purse the lips is like saying mmmm; pull back and tighten the lips with the lips closed.) Although the English words used to describe the ASL signs are written out in order, in sign language a person forms the signs "look at", "long time", and "intently" at the same time.

ASL has a rich system for modifying the meaning of signs. Verbs such as "look at" can be changed to indicate that the activity takes place without interruption, repeatedly, or over a long time. The adjective "sick", for example, is formed by placing the right middle finger on the forehead and the left middle finger on the stomach. By forming the sign "sick" and repeatedly moving the left hand in a circle, the signer can indicate that someone is characteristically or always sick.

Facial grammar, such as raised eyebrows, also can modify meaning. For example, a signer can make the statement "He is smart" by forming the ASL sign for "smart" --placing the middle finger at the forehead -- and then quickly pointing it outward as if toward another person to indicate "he". To pose the question "Is he smart?" the signer accompanies this sign with raised eyebrows and a slightly tilted head.

People who sign sometimes use finger spelling to represent letters of the alphabet. In some sign languages, including ASL, finger spelling serves as a way to borrow words from spoken language. A deaf person might, for example, choose to fingerspell "d-o-g' for "dog" instead of using a sign. Several types of finger spelling systems exist.

Linguists still have much to learn about the world's sign languages. What has become clear is that hundreds, if not thousands, of sign languages exist around the world.

According to the passage, which of the following statements is TRUE?

A．Linguists have found that sign languages and spoken languages differ from each other in many fea- tures.

B．Like spoken languages, which use units of form. to produce words, sign languages use units of sounds.

C．Separately, b, e, and t have a meaning and together they form. the word bet.

D．Spoken languages contain units of form. that by themselves hold no meaning, but when combined create a word.

Linguists have found that sign languages and spoken languages share many features. Like spoken languages, which use units of sounds to produce words, sign languages use units of form. These units are composed of four basic hand forms: hand shape, such as an open hand or closed fist; hand location, such as on the middle of the forehead or in front of the chest; hand movement, such as upward or downward; and hand orientation, such as the palm facing up or out.

In spoken languages units of sound combine to make meaning. Separately, b, e, and t have no meaning. However, together they form. the word bet. Sign languages contain units of form. that by themselves hold no meaning, but when combined create a word. Spoken languages and sign languages differ in the way these units combine to make words, however. In spoken languages units of sound and meaning are combined sequentially. In sign languages, units of form. and meaning are typically combined simultaneously.

In American Sign Language (ASL) signs follow a certain order, just as words do in spoken English. However, in ASL one sign can express meaning that would necessitate the use of several words in speech. For example, the words in the statement "I stared at it for a long time" each contain a unit of meaning. In ASL, this same sentence would be expressed as a single sign. The signer forms "look at" by making a V under the eyes with the first and middle fingers of the right hand. The hand moves out toward the object being looked at, repeatedly tracing an oval to indicate "over a long time". To express the adverb "intently" the signer squints the eyes and purses the lips. (To purse the lips is like saying mmmm: pull back and tighten the lips with the lips closed.) Although the English words used to describe the ASL signs are written out in order, in sign language a person forms the signs "look at", "long time", and "intently" at the same time.

ASL has a rich system for modifying the meaning of signs. Verbs such as "look at" can be changed to indicate that the activity takes place without interruption, repeatedly, or over a long time. The adjective "sick", for example, is formed by placing the right middle finger on the forehead and the left middle finger on the stomach. By forming the sign "sick" and repeatedly moving the left hand in a circle, the signer can indicate that someone is characteristically or always sick.

Facial grammar, such as raised eyebrows, also can modify meaning. For example, a signer can make the statement "lie is smart" by forming the ASL sign for "smart" --placing the middle finger at the forehead -- and then quickly pointing it outward as if toward another person to indicate "he". To pose the question "Is he smart?" the signer accompanies this sign with raised eyebrows and a slightly tilted head.

People who sign sometimes use finger spelling to represent letters of the alphabet. In some sign languages, including ASL, finger spelling serves as a way to borrow words from spoken language. A deaf person might, for example, choose to fingerspell "d-o-g" for "dog" instead of using a sign. Several types of finger spelling systems exist.

Linguists still have much to learn about the world's sign languages. What has become clear is that hundreds, if not thousands, of sign languages exist around the world.

According to the passage, which of the following statements is TRUE?

A．Linguists have found that sign languages and spoken languages differ from each other in many features.

B．Like spoken languages, which use units of form. to produce words, sign languages use units of sounds.

C．Separately, b, e, and t have a meaning and together they form. the word bet.

D．Spoken languages contain units of form. that by themselves hold no meaning, but when combined create a word.

New towns and other non-agricultural uses occupy large amounts of degraded land.

A．Y

B．N

C．NG