【正文】 ational Zoo? A. They are very humid in winter. B. They light up in time to music. C. They are usually very crowded all the year round. D. They are free of charge. 23. Who are the intended readers of the passage? A. Students. B. Tourists. C. Parents. D. Zoo keepers. B On June 10, 2021, I graduated from U of T, Scarborough. As I stood at University College waiting with hundreds of others, I suddenly felt overe with emotion. My very long and personal journey to convocation had started 20 years earlier on the St. Gee campus. I first enrolled at U of T through the Transitional Year Programme in 1983. At the time I was a 30yearold mother of two girls and married to “the boy next door.” I was both excited and terrified, and felt a little like Rita in the movie Educating Rita – traveling daily to classes in high heels. I decided that it would be better for my family if I attended classes closer to home, so I transferred to Scarborough for my second year. After picking up the girls from school, I’d bring them back to the studio where I rehearsed. Much to my horror, they would crawl around on the catwalks high above me. They were 10 and 12 and loved being at “Mom’s school.” My life changed drastically that year. On June 10, 1986, my husband of 13 years was killed in a horrific accident. I picked up my life the best I could under the circumstances and returned to U of T, but failed to get all the credits I needed. Twenty years later, on the eve of my 50th birthday, I ed an old professor, who encouraged me to sign up for a new class he was teaching about writing for the theatre. This time I made it all the way through. As I stepped inside Convocation Hall, I searched the crowd for my girls, now in their thirties. They were in the highest balcony, waving frantically at me – just as they had done from the catwalk in my drama class so long ago. I will never fet the look on the girls faces as they called out “Hi Mom.” I finally felt plete. 24. Which of the following can best replace the underlined word “convocation” in Paragraph 1? A. Birthday party. B. Graduation ceremony. C. College credits. D. Drama class. 25. When the author graduated from U of T, she was probably around __________ years old. A. twenty B. thirty C. forty D. fifty 26. What do we know about the author’s daughters? A. They helped her with housework when she attended college. B. They played with her during her rehearsals. C. They forted her when she lost her husband. D. They were proud of her success in the end. 27. Which word can best describe the author’s attitude towards her studies? A. Curious. B. Sympathetic. C. Persistent. D. Optimistic. C Red means “stop,” green means “go,” and yellow means “hurry up and make that damn light.” Why those colors, though? Why not blue, purple, and brown? I have to admit that aside from a hunch that it had to do with wavelengths, I had no idea myself, so I decided to look into it. The answer, as it turns out, is a little plicated, but makes sense. The earliest traffic signals were designed for trains, not cars. They were red and green, gaspowered, and more than a little dangerous in the event of a leak. Red symbolizes danger in many cultures, which makes sense, considering it has the longest wavelength of any color on the visible spectrum, meaning you can see it from a greater distance than other colors. Red has meant stop since long before cars existed, with train signals’ use of red dating back to the days when mechanical arms lifted and lowered to indicate whether the rail ahead was clear. So that one’s simple. Green’s role in lights has actually changed dramatically over time. Its wavelength is next to (and shorter than) yellow’s on the visible spectrum (光譜 ), meaning it’s still easier to see than any color other than red and yellow. Back in the early days of railway lights, green originally meant “caution,” while the “allclear” light was, well, clear or white. Trains, of course, take an interminably long time to stop, and legend has it that several disastrous collisions happened after an engineer mistook stars in the night horizon for an allclear. Thus, green became “go,” and for a long time, railways used only green and red to signal trains. From the earliest days of motoring up until the mid1900s, not all stop signs were red – many were yellow, along with yield signs, because at night it was all but impossible to see a red stop sign in a poorly lit area. The yellow stopsign craze began in Detroit in 1915, a city that five years later installed its first electric traffic signal, which happened to include the very first amber traffic light, at the corner of Michigan and Woodward Aves. But what of those weird yellow stop signs, you ask? A