题目

一个五次项式,它任何一项的次数(   ­). ­  A.都等于5     ­B.都大于5­       C.都不大于5­           D.都不小于5 ­ 答案：C­Now more and more children leave their parents when they grow up. It makes the old feel         .A．aloneB．lonelyC．frightenedD．enjoyable