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心电图检查胸导联ST段下移0.2rev，T波倒置，最需要与哪种疾病鉴别
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Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
听力原文： My report is on local control of schools. First, I was surprised to learn that public schools in the United States are not the same in every state or even from community to community within the state. The reason for differences in organization, curriculum, and school policies is because each school district has a governing board, called the school board, which makes the decisions about the way the schools in their district will be run. Of course, a superintendent is selected by the board to carry out policies and the superintendent is usually a professional educator, but the board, often made up of community leaders who are not professional educators, must approve the recommendations of the superintendent.
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First Aid
First aid is emergency care for a victim of sudden illness or injury until mere 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 net 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.
First aid may bring about all the following results EXCEPT
如某投资组合由收益呈完全负相关的两只股票构成，在该组合的标准差为零时，组合的风险被全部消除。 ()
听力原文：M: Hi Jane, it's nice to see you again. I heard you went to the US during your vacation.
W: Yes. I went to New York to attend a summer course in English.
M: Wow. You were lucky. How long did you stay there？
W: About 50 days. I went there on July 5th and came back on August 25th.
M: How about the course？
W: The course was very good. The teachers were nice. They taught us to listen, speak, read and write in English, but it was mostly speaking. One interesting thing I found is freedom. You can sit anywhere you like in the classroom. You can ask the teacher questions at any time during the class, and you are welcome to share your ideas with the class. I really liked this kind of class.
M: How interesting! Maybe our teacher should try that.
What was the woman's main purpose of going to New York during the vacation？
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