题目

根据句意及首字母提示完成单词。 1．His father often wears a black h______. 2．I can't find my E______ book. 3．The ball is on the f______， under the chair. 4．I'm t______，but Cindy isn't.Look，her books are everywhere. 5．There is a model p______ in the room. 答案：1hat   2 English  3floor 4 tidy  5 plane 古人“钻木取火”，这是用____________方式使物体内能增加的；现代利用“太阳灶”是利用__________方式使物体内能增加的．