练习：
1. How can one learn earlier whether he or she suffer simmering kidney disease?
A By cholesterol checks.
B By urine and blood tests.
C By keeping a close eye on one's kidneys.
D By measuring the volume of urine output.
2. How many Americans suffer chronic kidney disease according to an estimation?
A 1,9,000,000.
B 400,000.
C 50,000.
D 37,000.
3. How many Americans suffered end-stage kidney failure and required dialysis or a transplant to survive twenty years ago according to an estimation?
A 400,000.
B 300,000.
C 200,000.
D 100,000.
4. What did the Archives of Internal Medicine call for doctors caring for heart patients to do?
A To examine their patients' heart function carefully.
B To have their patients' chests X-ra Yed regularly.
C To select volunteers from their patients for a kidney screening.
D To start rigorously checking out their patients' kidneys.
5. Which of the following is NOT one of the three markers of kidney function?
A Levels of the protein albumin in the urine.
B Levels of the white blood cells in the blood.
C The rate at which kidneys filter blood.
D Whether one is anemic or not
