问题
选择题
1864年，德国科学家萨克斯将绿色叶片放在暗处几小时，然后把此叶片一半遮光，一半曝光。经过一段时间后，用碘蒸气处理叶片，成功地证明了绿色叶片在光合作用中产生了淀粉。在此实验中，萨克斯看到的现象是[ ]
A．叶片全变蓝
B．遮光一半变蓝
C．曝光一半变蓝
D．叶片全不变蓝
答案
答案：C
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1864年，德国科学家萨克斯将绿色叶片放在暗处几小时，然后把此叶片一半遮光，一半曝光。经过一段时间后，用碘蒸气处理叶片，成功地证明了绿色叶片在光合作用中产生了淀粉。在此实验中，萨克斯看到的现象是[ ]
A．叶片全变蓝
B．遮光一半变蓝
C．曝光一半变蓝
D．叶片全不变蓝
答案：C
When I was young, I belonged to a club that did community service work. There was one specific event that was 1 for me. I spent three or four hours handing out warm dinner to the ___2_ out in the streets. After that I went to a homeless shelter(避难所) not far from the Bay Bridge. I was in high school and at the time my sister was too young to join in . She wanted to help, 3 she made many chocolate chip cookies for me to __4_____ and hand out to people. When getting to the shelter, I passed out the 5 . I began making sandwiches and shared them with the crowd. I had the containers with my sister’s cookies in them and began to walk around, offering them to anyone near me. I walked 6 to an old gentleman and said, “Sir, would you like a cookie?” He stopped and turned around, looked at me 7 and said, “What did you say? Did you call me sir?” I told him I had , and his eyes 8 a little bit and said, “No one has ever called me sir.” So he was completely 9 . It struck me. I explained I had been raised that regardless of (不顾) 10 and social status（地位）, everyone deserved(值得） 11 . It saddened me to think that just because he was homeless, no one offered him the honor . It broke my heart. I just didn’t understand 12 no one ever called him sir. I had never thought that anyone was 13 me because I wasn’t raised that way. Every single person deserves to be treated with respect. Years later, I still carry that 14 and the lesson it taught me. Somtimes, what we take for granted can really make a difference in 15 life.
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