[单选题]导致老年人排尿次数增加，不属于泌尿系统主要变化的是(　　)。
A.:膀胱肌肉萎缩
B.:膀胱内尿的容量增多
C.:膀胱扩约肌萎缩
D.:膀胱内尿的容量减少

In many parts of the world there is a debate about whether children should use pocket calculators in math lessons. They help children work faster and pass examinations. But critics say that they make the subject to o easy.
This concern that .technology is doing much of our thinking for us cuts across many areas. People who use computers for many years find that their handwriting had deteriorated (变差). Artists paint pictures using computer software rather than learning to draw and paint. Tennis players no longer try to outwit (在智慧上战胜) their opponents. Advances in tennis racket technology make it easier to just blast the ball past them.
Technology used to be about freeing people from boring physical labor like washing clothes. Now it is taking over increasingly complicated mental functions. Analysts are also worded about the effect of media saturation (渗透). The idea is that a constant diet of television has made people to o impatient to listen while things a
A. to o much exposure to 'TV viewing is negative to people's intellectual well-being
B. to o much exposure to TV viewing makes people simple-minded
C. TV attracts Pe9Ple with exciting pictures
D. TV keeps people informed about current events