我们要孝敬父母的长辈，最主要是因为[ ]
A．他们是父母的父母
B．他们与父母是亲属关系
C．他们为社会、为家庭做出过贡献
D．他们的年龄比较大
答案：C
已知溶质质量分数为96%的酒精溶液的物质的量浓度为16.6mol•L-1，试判断48%的酒精溶液的物质的量浓度（mol•L-1）（已知酒精的密度小于1）（ ）
A．大于8.3
B．等于8.3
C．小于8.3
D．无法确定
Which of the following discharge instructions should the nurse give the parents of an infant with a temporary colostomy
A．Flush the stoma with tap water at least once a day.
B．Allow the diaper to absorb the colostomy drainage.
C．Give the infant plenty of liquids to drink.
D．Expect the stoma to become dusky red within 2 weeks.
