老年人的（）是老人自信的资本。
A.体力
B.能力
C.听力
D.视力
参考答案：B
0.61.21.8______3.0______．
Which of the following functions would the nurse expect to be unrelated to the placenta()
A. Production of estrogen and progesterone.
B. Detoxification of some drugs and chemicals.
C. Exchange site for food, gases, and waste.
D. Production of maternal antibodies.
