3. With this finding, scientists are opening the door to potential therapies to having ourselves heal ourselves: 有了这一发现，科学家们正在打开让我们自愈的潜在疗法的大门。

　　练习：

　　1. The human heart stops producing cardiac cells

　　A when a person is born.

　　B when a person becomes old.

　　C when a person gets sick.

　　D when a person dies.

　　2. The finding could prove to be helpful to

　　A the study of longstanding mysteries.

　　B the analysis of cardiac cells.

　　C the prevention of chronic diseases.

　　D the treatment of heart disease.

　　3. The people whore in their mid-70s, only 0.45 percent of cardiomyocytes

　　A are still functional

　　B are replaced each year.

　　C are lost each year.

　　D are damaged each year.

　　4. Chronic heart failure is associated with

　　A the death of heart cells.

　　B the life span of a person.

　　C the effects of pharmaceuticals.

　　D the weight of the patient.

　　5. It remains unknown whether the rate of cell turnover in diseased hearts

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