题目

  There is no power like ______ power of confidence, and there is no student as competitive as ______ student who trusts his own abilities.         A. the; a      B. a; the      C. /; a      D. the; / 答案：A如图所示为冰在加热过程中，温度随时间变化的图象．以下说法中不正确的是（ ） A.冰是一种晶体B.冰的熔点为0℃C.从t1到t2 ， 冰处于熔化过程D.从t1到t2 ， 冰的质量保持不变