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During the summer before Patty entered fifth grade, she decided to try a new sport. Swim training was nearly over and Patty was the fastest swimmer in her age group. She had always been the best. The neighborhood was offering a one-week tennis training course. Patty and her friend Darla got permission from their parents to join.
On Saturday morning, Darla’s mom took the girls to a store and bought them each a good, used tennis racket. “If you girls stick to tennis, then we’ll talk about a new racket. These will do for now.” The girls were excited about their new purchases. On Monday morning, at 7:00 a.m., Patty’s mom woke her up. “It’s time for tennis!” Patty covered her face. “Mom, it’s too early!” She made great effort to get out of bed and down to the breakfast table. Patty finished breakfast and ran to Darla’s house, then they walked to the court.
Mrs. Cane, the tennis coach, lined everyone up and started with the basics. After that, Mrs. Cane tirelessly taught them to practice their forehand and backhand. By the end of the week, Patty had made impressive progress. Mrs. Cane commented that Patty had lots of potential. Darla, on the other hand, was struggling. The other teenagers were having a tough time of it, too. Patty was the only one who seemed to get somewhere.
Since then, Darla had always been out in the August heat, practicing her serves or hitting the ball. Patty wasn’t really interested. She felt she was such a “natural” for tennis that she really didn’t need to practice. By the end of the summer, Darla began to get the hang of it. She joined a neighborhood junior tennis team. There would be matches every Thursday. Patty wanted to join as well, but she didn’t want to miss her favorite TV show. She told herself that she would join it when she got some free time. If Darla had fun, she would join the team in the spring.
注意：
1. 续写词数应为150左右；
2. 请按如下格式在答题卡的相应位置作答。
The week before school started, Mrs. Cane held another training course.
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Patty couldn’t stop thinking of her poor performance on the way home.
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y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
