题目

用括号内所给单词的适当形式填空，补充发明的时间、地点和发明者的信息。注意句子的语态。 1.The tea was first ________(drink) by Shen Nong nearly 5，000 years ago. 2.Cha Jing was ________(write) by Lu Yu，“the saint of tea”，during the Tang Dynasty. 3.According to Chinese history，kites were first ________(use)by Han Xin. 4.Abacus was ________(create) in China in the sixth century by a Chinese man. 5.Basketball was ________(invent) by a ________(Canada) doctor in the 19th century. 6.The jeans were first ________(make) by a young man called Levi8．如图所示，凸五面体ABCED中，DA⊥平面ABC，EC⊥平面ABC，AC=AD=AB=1，BC=$\sqrt{2}$，F为BE的中点．（1）若CE=2，求证：①DF∥平面ABC；②平面BDE⊥平面BCE；（2）若二面角E-AB-C为45°，求直线AE与平面BCE所成角．