题目：【Reading Comprehension】

    `About 79 million Americans have pre-diabetes (糖尿病前期 ). That means they have blood sugar that ' s higher than normal but not high enough to be diagnosed (诊断) with type 2—at least not yet. One long-term study reported by the American Diabetes Association found that 11% of people with pre-diabetes develop the full-blown disease each year. Another study shows that pre-diabetes will probably become type 2 in 10 years or less.

    Yet,that process is not inevitable. Last year, scientists in Colorado found that people with pre-diabetes who lowered their blood sugar to normal levels-even briefly-were 56% less likely to reach type 2 levels.

    If you have pre-diabetes,here are four steps to help prevent or delay a diabetes diagnosis :

    Lose 7% of your body weight. That is about 15 pounds for the persons who weigh 200. Dropping that small percentage has been shown to lower the risk of developing type 2 by close t0 60%.

    Exercise 30 minutes five days a week. Whether you do the 30 minutes in one shot or in three 10-minute sessions,the benefit is the same. Choose certain exercises, such as fast walking, playing tennis or lifting weights. Physical activity such as sweeping floors works , too.

    Turn to your doctor. In some cases , pre-diabetes raises the risk of heart disease and stroke by 50%. Your doctor may use some medicine to control your glucose (萄萄糖) levels and keep your blood pressure in check.

    Know your numbers. To see if your pre-diabetes is improving , have your blood sugar checked regularly. A fasting blood sugar of 100 t0 125 mg/dl suggests pre-diabetes;126 mg/dl or above is diabetes;and below 100 is normal. Other tests ,including glucose tolerance and AIC , also are used to monitor blood sugar.

【问题】 What do we learn from the two studies mentioned in Paragraph l?

A. Enough attention should be paid to the treatment of type 2.

B. Pre-diabetes will surely become type 2 diabetes. .

C. Pre-diabetes is ranked No.1 danger threatening Americans' health.

D. Pre-diabetes is likely to become diabetes within years.

【答案】D

【考情点拨】事实细节题。

【应试指导】第一段第三句表明，美国糖尿病协会一项长期研究发现，糖尿病前期的人中每年有11%会发展成为糖尿病晚期;根据第一段第四句可知，另外一项研究表明，糖尿病前期在十年或更短时间内很可能会发展成为2型糖尿病。由此可知，糖尿病前期在几年内可能发展成糖尿病，故选D。

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