Passage 3
  The current emergency in Mexico City that has taken over our lives is nothing. I could ever
have imagined for me or my children. We are living in an environmental crisis, an air-pollutionemergency of unprecedented severity. What it really means is that just to breathe here is to play a dangerous game with your health.
  As parents, what terrorizes us most are reports that children are at higher risk because they
breathe more times per minute. What more can we do to protect them and ourselves? Our
pediatrician’s (儿科医师的) medical recommendation was simple: abandon the city permanently.
  We are foreigners and we are among the small minority that can afford to leave. We are here
because of my husband’s work. We are fascinated by Mexico—its history and rich culture.     We know that for us, this is a temporary danger. However, we cannot stand for much longer the fear we feel for our boys. We cannot stop them from breathing.But for millions, there is no choice. Their lives, their jobs, their futures depend on being here.
  Thousands of Mexicans arrive each day in this city. Desperate for economic opportunities.
Thousands more are born here each day. Entire families work in the streets and practically live
there. It is a familiar sight: as parents hawk goods at stoplights, their children play in the grassy
highway dividers, breathing exhaust fumes. I feel guilty complaining about my personal situation; we won’t be here long enough for our children to form the impression that skies are colored only gray. And yet the government cannot do what it must to end this problem. For any country, especially a developing Third World economy like Mexico’s, the idea of barring from the capital city enough cars, closing enough factories and spending the necessary billions on public transportation is simply not an option. So when things get bad, as in the current emergency,
  Mexico takes half measures—prohibiting some more cars from circulating, stopping some
factories from producing—that even its own officials concede aren’t adequate.
  The word “emergency” implies the unusual. But when daily life itself is an emergency, the
concept loses its meaning. It is human nature to try to adapt to that which we cannot change. Or to mislead ourselves into believing we can adapt. ( 388 words )

51. According to the passage, the current emergency in Mexico City refers to ______.
A. serious air pollution B. economic crisis
C. unemployment D. natural disaster
52. Which of the following statements is NOT TRUE according to the passage?
A. Kids are in greater danger than grown-ups in Mexico City.
B. The author is not a native Mexican.
C. The author’s husband is a pediatrician.
D. The Mexican history and culture appeal to the author.
53. The word “hawk” (Paragraph 3) most probably means ______.
A. sell B. transport C. place D. deliver
54. The Mexican government takes half measures to solve the pollution problem because ______.
A. Mexican economy depends very much on cars and factories
B. it is not wise enough to come up with effective measures
C. Mexicans are able to adapt themselves to the current emergency
D. Mexicans enjoy playing dangerous games with their health
55. The purpose of the passage is to ______.
A. describe the harmful air pollution
B. explain the way to prevent air pollution
C. show the worries about the air pollution
D. recommend a method to avoid air pollution

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