D. The bloodstream contains no oxygen molecules.

　　38. The underlined part “fix the situation” means “___”.

　　A. use more oxygen it needs

　　B. increase the air pressure

　　C. reduce the amount of blood

　　D. bump more blood to the brain

　　39. Why should passengers not smoke or drink before flying?

　　A. They weaken the body’s ability to use oxygen.

　　B. Smoking may pollute the air inside the airplane.

　　C. Drinking alcohol may raise one’s blood pressure.

　　D. Drinking is forbidden at the airport.

　　40.Do you think which the following title is the best title for this passage?

　　A. Tralling

　　B.how to travel

　　c. some suggestions about on the plane while travelling

　　D. the causes and effects of hypoxia

　　B

　　Most Americans believe that someone isn’t grown-up until the age of 26 and they should complete their education, have a full-time job, have a family to support and be financially independent. They also believe that becoming a real grown-up is a process which begins at about the age of 20 and takes about five years, according to the report from the University of Chicago’s National Opinion Research Center.

　　The findings are based on a representative sample of 1,398 people over the age of 18 who were surveyed in person. The survey found that people expect the transitions to grown-up status to be completed at the following ages: age 20.9 self-supporting; age 21.1 no longer living with parents; age 21.2 having a full-time job; age 22.3 education completed; age 24.5 being able to support a family financially; age 25.7 getting married;

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