(1)求出利潤 S（元）與銷售單價 x（元）之間的關係式？
（利潤 = 營業額 − 成本）
已知(AP) ̅和(AP) ̅和(DR) ̅皆垂直於地面，且∠OCD=30^0，坐墊高度(AP) ̅=100公分，且(BP) ̅=(OQ) ̅=(DR) ̅=10公分，(BO) ̅:(OD) ̅=2:1，若此人的腿長為(AC) ̅+(CO) ̅之長度，求此人的腿長為多少公分?
How many（多少）feet（腳）do two crocodiles, three lions and four bears have?
May 31, 2019
To whom it may concern,
I am writing to you in support of Hank Liao and his desire for the bachelor degree in violin. As both Hank’s English and homeroom teacher in A+ senior High School for 3 years, I highly recommend he be given the opportunity to attend your school.
Hank has been an attentive, active, and quick learner in my English class. He always concentrates on the lesson, actively participates in the class discussion, and never hesitates to raise questions and provide his perspectives as well. Moreover, he picks things up quickly. While most of the students are struggling with a new grammar I just introduce, he is able to help others comprehend it. All of these make him have a good academic performance in the subject of English. And I believe that Hank will definitely display the attitude and ability in other fields which he is interested in.
Hank is also a student of humor and compassion. Since students in the same class in Taiwan spend more than 9 hours together in one class, it is inevitable for them to have quarrels or conflicts. Hank is the one who can always ease the tension with his sense of humor. Last year, a girl student in my class betrayed her friends’ trust, and it turned out that she was shunned by many of her classmates intentionally. The girl student fell into depression and even tried to commit suicide. Hank is one of the few students who offered supports to the girl through the depression. Therefore, as a homeroom teacher, I notice that Hank has the ability to ease the dispute, which makes him maintain a good relationship with others. I think having good communication ability is a desirable personal trait in a group, in today’s society.
Apart from a sense of humor and compassion, he has a strong logic and reasoning ability. He is fond of board games. He often introduces challenging board games to the class. While playing the board games with him, I can see his strong reasoning ability which can be seen not only in game playing but also in essay writing, demonstrating his strong and precise statement and argument. It should be a must-have ability in the pursuit of his further studies.
If you can give Hank a chance to show his ability and personal traits, I’m sure you will find him a highly potential student. In conclusion, I recommend Hank Liao for admission to your school. ____(A)______