1. A call has the meaning of summoning or calling. If someone is sick on an airplane, you should call a doctor.A few other options, address means "to call someone", inform means "to tell" and survey means "to investigate". "The other options, address, inform, and survey, do not fit the context.
2. C. This question is about vocabulary and contextual understanding. Someone on the plane suddenly fainted is a sudden incident, incident means "event", disaster means "disaster", used here, overstated.
3. D. How often does this happen? How often does this kind of thing happen? The author is curious about this. How often is the only way to connect the four options.
4. A Vocabulary and contextualization. The word "ed" has been added to all four options to indicate the passive voice, and the meaning of options A, B, C and D is "to face" and "to treat" respectively, A, B, C and D mean "face", "treat", "recognize" and "assume" respectively. The author thinks about how he would face a serious medical accident in mid-air by the small accident at the beginning of the article.
5. B. Access to - "to have the right to use, to approach". The writer wants to know how to deal with medical emergencies in the absence of hospital paramedics and emergency medical equipment.
6.C This question is about contextual connection. The context expresses, "When last week's Medical Weekly ran a study on in-flight medical incidents, I read it with great interest."
7. D The most likely action from the weekly was "published". D. The most likely action of the weekly would be "published."
8.C. The word "with interest" is accompanied by the word "with."
9. The author found out the average number of in-flight medical emergencies in the U.S. per day, and statistics usually use average figures to illustrate the problem. The other options, a sum of, an amount of, and a number of, mean "a sum of", "some" (followed by an uncountable noun), and "some" (followed by an uncountable noun). some" (followed by a countable noun).
10. D Serious is used to express the severity of an illness. So, here choose serious.
11.C The answer here needs to be found later. A. The disease that can make a pilot change course is contrasted with a mild fainting spell, so the conjunction here is but.
12.A The focus here is on the subtle differences in vocabulary. inspire and encourage clearly do not meet the requirements; require is often used in accordance with the rules, practices, and circumstances put forward by the requirements to do someone to do something. The original meaning of the article is that there are some people on board the plane. According to the meaning of the original text, there is a seriously ill person on board, and this situation requires the pilot to change course to save lives. Therefore, choose answer D.
13.A The writer here gives an example of what kind of disease is a serious sudden illness. The word "contain" means to "hold, contain", and only "include" best fits the meaning of the question.
14. The four options are enjoyable, stimulating, tedious and stressful. As you can see from the following, the airplane has to fly to an altitude of 5,000-8,000 feet, a process that is not easy and pleasant, and can cause both illness and pain, and is by no means tedious, so the choice here should be stressful.
15.BThe questionable pronouns are examined here. For first-time fliers, cabin pressure at altitude is equivalent to that of living at 5,000-8,000 feet above sea level." What refers to pressures, so B.
16. It is clear from the following that a comparison is made here with passengers with heart disease traveling on airplanes. It means that most healthy people can cope easily.
17.B Refer to the above. Since this is an objective description, a passenger with a heart condition "could/would feel chest pain" in the absence of oxygen.
18.D The word "chest pains" was mentioned in the previous paragraph, so another word should be used here.
19.A A - whatever happens.
20.C This question is about the fixed collocation at least.