青霉素的杀菌作用的原理是（）A．抑制核糖体的50S亚基的活性 B．抑制肽链的延伸 C

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The United States is facing a growing concern: rising obesity(肥胖) rates. A new report says adult obesity rates rose last year in 23 of the 50 states. And, the percentage of obese children was at or above 30% in 30 states. Mississippi had the highest rate of adult obesity in the new study. 32.5% of the state’s adults were obese. Mississippi also had the highest rate of obese and overweight children. 44.4% of all children between the ages of ten and seventeen years were obese or overweight.
The study used a system of measurement called the Body Mass Index(B-M-I) to define words like obese and overweight. To find your B-M-I, divide your weight in kilograms by height in meters squared. A normal B-M-I is between 18.5 and 24.9. The B-M-I of someone overweight is between 25 and 29.5. And, an obese person has a B-M-I above 30.
The new report says widespread obesity is increasing the rates of long-lasting diseases, such as heart disease. Obesity is also responsible for an increasing part of health care costs in the United States. Health care costs have grown while many Americans are getting fatter. A lack of physical exercise, watching TV too much and eating junk food contribute to the rising obesity rate. The report says the current economic recession(经济衰退) could worsen obesity rates by increasing food prices. This would make healthy foods cost more. The report blames the recession for rising rates of depression, anxiety and stress, which are closely linked to obesity in many cases.
The report offers some ideas for dealing with obesity within government health care reforms. They include making sure that every adult and child has a right to preventive medical services. Also, people should do more physical exercise, drive less and eat less junk food to fight obesity.
Widespread obesity in the US

小题1:	Rising obesity rates	◆小题2:      obesity rates rose last year in 23 of the 50 states.
		◆Child obesity rate was at or above 30% in 30 states.
Consequences	increasing the rates of 小题3:___________
	increasing 小题4:       of health care
小题5:	小题6:        physical exercise
	watching TV too much
	eating junk food
	experiencing recession
小题7:	小题8:	小题9:          preventive medical services
	People	doing more physical exercise
		小题10:           less
		eating less junk food