便秘是由于( )的原因导致的。
A．老年人吃的过少
B．老年人吃得过多
C．老年人内分泌功能衰退
D．老年人消化功能衰退
参考答案：D
阅读下列短文，判断正（A）误（B）。
( )1. Jane often annoys her classmate in math classes.
( )2. Jane does best in P.E.
( )3. Jane is good at writing compositions.
( )4. She needs to work hard at learning languages ,or she will fail in them.
( )5. According to the form, we can know Jane has got ten subjects.
同时属于不变资本和固定资本的生产资料是______。
A．机器设备 B．原料 C．燃料 D．辅助材料
