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一台微机必备的输人输出设备是（）。
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A Special Clock
Every living thing has what scientists call a biological clock that controls behavior. The biological clock＿＿＿＿＿(51) plants when to form. flowers and when the flowers should open. It tells insects when to ＿＿＿＿＿＿(52) the protective cocoon (防护卵袋) and fly away, and it tells animals and human beings when to eat, sleep and wake.
Events outside the plant and animal__________(53) the actions of some biological clocks. Scientists recently found, for example, that a tiny animal changes the color of its fur because of the_________(54) of hours of daylight. In the short ________(55) of winter, its fur becomes white. The fur becomes gray brown in ________(56) in the longer hours of daylight in summer.
Inner signals control other_______(57) clocks. German scientists found that
some kind of internal clock seems to order birds to begin their long migration
_________(58) twice each year. Birds __________(59) from flying become restless
when it is time for the trip,_________(60) they become calm again when the time of the flight has ended.
Scientists say they are beginning to learn which _______(61) of the brain contain biological clocks. An American researcher, Martin Moorhead, said a small group of cells near the front of the brain _________(62) to control the timing of some of our actions. These __________(63) tell a person when to wake, when to________(64) and when to seek food. Scientists say there probably are other biological clock cells that__________ (65) other body activities.
第 51 题
First Aid
First aid is emergency care for a victim of sudden illness or injury until more skillful medical treatment is available. It may save a life or improve certain vital signs including pulse, temperature, a clear airway (气道), and breathing. In minor emergencies, first aid may prevent a victim's condition from turning worse and provide relief from pain. First aid must be administered as quickly as possible. In the case of the critically injured, a few minutes can make the difference between complete recovery and loss Of life.
First-aid measures depend upon a victim's needs and the provider's level of
knowledge and skill. Knowing what not to do in an emergency is as important as knowing what to do. Improperly moving a person with a neck injury, for example, can lead to permanent spinal (脊柱的) injury and paralysis (瘫痪).
Despite the variety of injuries possible, several principles of first aid apply to all emergencies. The first step is to call for professional medical help. The victim, if conscious, should be reassured that medical aid has been requested, and asked for permission to provide any first aid. Next, assess the scene, asking other people or the injured person's family or friends about details of the injury or illness, any care that may have already been given, and preexisting conditions such as diabetes (糖尿病) or heart trouble, The victim should be checked for a medical bracelet (手镯) or card that describes special medical conditions. Unless the accident scene becomes unsafe or the victim may suffer further injury, do not move the victim.First aid requires rapid assessment of victims to determine whether life-threatening conditions exist. One method for evaluating a victim's condition is known by the acronym (首字母缩写词) ABC, which stands for:
A - Airway: is it open and clear？
B - Breathing: is the person breathing？ Look, listen, and feel for breathing.
C - Circulation: is there a pulse？ Is the person bleeding externally？ Check skin color and temperature for additional indications of circulation problems.
第 41 题 First aid may bring about all the following results EXCEPT
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