By ten o’clock, things were out of control. Alex was wondering why the fish in the jar refused his bread and butter. Mike was trying to show off his talent by decorating the kitchen wall with his colour pencils. Randy, thankfully, appeared to be reading quietly in the family room，but closer examination showed that he was eating apple jam straight from the bottle with his hands. Brad realised that the talk show was over and reading would be impossible.
At exactly 11:17, Brad called the daycare centre (日托所）.“I suddenly have to go into work and my wife’s away. Can I bring the boys over in a few minutes?” The answer was obviously “yes” because Brad was smiling.
49. When his wife left home. Brad expected to           .
A. go out for a walk in the park          
B. watch TV talk show with his children
C. enjoy his first day off work          
D. read the newspaper to his children
50. Which of the following did Randy do?
A. Drawing on the wall                 B. Eating apple jam
C. Feeding the fish.                    D. Reading in a room
51.Why did Brad ask the daycare centre for help?
A. Because he wanted to clean up his house.
B. Because he suddenly had to go to his office
C. Because he found it hard to manage his boys home.
D. Because he had to take his wife back
52. This text is developed           .
A. by space    B. by comparison   C. by process   D. by time
C
Eating too much fatty food, exercising too little and smoking can raise your future risk of heart disease. But there is another factor that can cause your heart problems more immediately: the air you breathe.
Previous studies have linked high exposure (暴露）to environmental pollution to an increased risk of heart problem, but two analyses now show that poor air quality can lead to heart attack or stroke (中风）within as little as a few hours after exposure. In one review of the research, scientists found that people exposed to high levels of pollutants (污染物）were up to 5% more likely to suffer a heart attack within days of exposure than those with lower exposure. A separate study of stroke patients showed that even air that the U. S. Environmental Protection Agency (EPA) considers to be of “moderate” (良好）quality and relatively safe for our health can raise the risk of stroke as much as 34% within 12 to 14 hours of exposure.
The authors of both studies stress that these risks are relatively small for healthy people and certainly modest compared with other risk factors such as smoking and high blood pressure. However, it is important to be aware of these dangers because everyone is exposed to air pollution regardless of lifestyle choices. So stricter regulation by the EPA of pollutants may not only improve environmental air quality but could also become necessary to protect public health.
53. The text mainly discusses the relationship between        .
A. heart problems and air quality    B. heart problems and exercising
C. heart problems and smoking    D. heart problems and fatty food

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