yellow   window____

《朕后备急法》的治疟验方：“青蒿一握，以水二升渍，绞去汁，尽服之。”给了屠呦呦以灵感，但用传统的“熬汤”的方法无法取得治疟疗效果，屠呦呦用低沸点的乙醚成功制取了青蒿提取物，开创了疟疾治疗新方法，全球数亿人因这种“中国神药”而受益。这表明（   ）

Mr. Smith gave his wife money every Friday evening. His wife always spent it all the next Wednesday, so that for the next three days she had no money to spend at all. One day Mr. Smith asked her, “But how did you spend all that money?” She answered, “I don’t know.” So one Friday evening, Mr. Smith gave her money together with an exercise book and a pencil. He said to his wife, “Please write down how you spend the money.” Next Tuesday, his wife had no money again. Mr. Smith took the exercise book to see how she had spent it. “I have done what you told me,” she said gladly. She had written “Friday, I got 18 pounds from Mr. Smith.” on the first page, and on the second page, she wrote, “Tuesday, I have spent it all.”

watch    learn     be    have      Chinese    
    Dick and Ellen come from America. Now they ____  in Tianjin. Every morning they get up very early. Then they go to work by car. They start their work at 8:30. They are very busy. They ____  lunch at 12:30. After lunch they work again. They finish their work at 5:30 p.m. In the evening Dick takes Chinese lessons because he wants ____  Chinese. Ellen stays at home and ____ TV. They like to talk with Chinese people. They often say "Chinese people are very friendly". They like to stay in ____  and they like to work with Chinese people.

如图，已知“人字梯”的5个踩档把梯子等分成6份，从上往下的第二个踩档与第三个踩档的正中间处有一条60cm长的绑绳EF，tanα=$\frac{5}{2}$，则“人字梯”的顶端离地面的高度AD是（　　）