题目

Kobe developed his basketball skills under the watchful eye of his father, who helped him become a p________ basketball player. (根据首字母单词拼写) 答案：【答案】professional【解析】考查形容词。句意：科比在他父亲的监督下发展了他的篮球技能，他父亲帮助他成为了一名职业篮球运动员。分析句子可知，设空处修饰名词作定语，应用形容词，根据首字母和句意，故填professional。起重机将质量为m的货物以a的加速度加速升高h，则在这段高度内(重力加速度为g) (     ) A．货物的重力势能一定增加mah B．货物的动能一定增加mah－mgh C．货物的机械能一定增加mah＋mgh D．货物的机械能一定增加mah