【简答题】If we remove the cladding of fiber, if the light signal can transmit in the core of fiber？

【简答题】Read the Text and answer the following questions: 1. How does the writer develop his main ideas about global warming in terms of organization? 2. Which structure does the writer use to illustrate the effects of global warming? 3. How does the writer arrange the effects and what are the signal words? 4. How many types of causes of global warming does the writer classify into? What are they? 5. How is Paragraph 11 organized? What are the signal words? 6. According to the writer, what are the three areas affected by global warming? 7. What are the four gases that have a large impact in the atmosphere? 8. According to some scientists, how many percent of the Great Barrier Reef will disappear by 2075 if the earth continues on the path it is on?

A．It monitors the signals transmitted from the drivers brain.

B．It can measure the driver's alcohol level in the blood.

C．It can quicken the driver's response to emergencies.

D．It bases its analysis on the driver's heartbeat.

A．It monitors the signals transmitted from the driver's brain.

B．It can measure the driver's alcohol level in the blood.

C．It can quicken the driver's response to emergencies.

D．It bases its analysis on the driver's heart beat.

A.It monitors the signals transmitted from the drivers brain.

B.It can measure the drivers alcohol level in the blood.

C.It can quicken the drivers response to emergencies.

D.It bases its analysis on the drivers heartbeat.

The satellite television signal is transmitted in the digital video format of______.

Nonverbal Signals

As humans, we communicate primarily through language. A speaker transmits his or her thoughts and feelings through words and expects the listener to obtain meaning from those words. However, nonverbal signals can be just as important in determining how the oral messages we relay are received and interpreted.Nonverbal signals can either reinforce or contradict the information we deliver with our spoken words. These signals include facial expressions, tone of voice, eye contact, body posture, and hand gestures. A person with a good understanding of nonverbal signals can ensure that the meaning of his or her words is clear.

If you are transmitting a distress message by radiotelephone you should ().

A.use English language

B.always use the International Code

C.preface it by the word“Interco”

D.follow the transmission with the radio alarm signal

Part A

Directions: Read the following three texts. Answer the questions on each text by choosing A, B, C or D. Mark your answers on ANSWER SHEET 1.

In recent years scientists have found that the laser has a wide variety of applications, making it one of the most important inventions for improving our quality of life.

One important field in which the laser has many applications is communications. Scientists have found that the laser beam can transmit human voices; as a result, telephone companies are now using laser light signals to transmit telephone calls through extremely small cables that are capable of carrying many more transmissions than the standard telephone cables. An additional advantage is that these systems using the laser light signals are also able to transmit video telephone conversations.

Another, perhaps less-known, field in which lasers are helping improve the quality of life is metrology—the science of measurement. The extremely straight, narrow laser beam can be used to put the parts of a structure being built into the correct position to each other. The laser beam has also been used to measure remote distances, for example, the precise distance from the Earth to the Moon. And finally, the laser can be used to measure the drifts of the Earth's plates. This measurement, along with other data, can help in the pre-diction of the earthquakes.

Probably the most vital application of the laser is in the field of medicine. Scientists have developed a laser kniffe that surgeons can use for operations. These knives are now used widely because they cut sharply and because the beam seals off the blood vessels that it cuts, thus reducing blood loss considerably.

When Dr. Theodore got the first laser to work in July 1960, what uses it would have were unknown; in fact he called it a multimillion-dollar "solution in search of a problem". As we have seen, the uses of the laser are numerous. It is being used in the fields of medicine, communications, and metrology. There are many, many more applications, such as in the areas of defense and space travel. What should be apparent by now is that there are many problems the laser is helping to solve, and that the laser, if used wisely, can be a life-saving device.

According to the text, the laser can______.

A．standardize telephone cables

B．remove communications jams

C．improve the quality of human voices

D．increase the capacity of communications