①2HCl  ②Mg²⁺③CO₂④ $\stackrel{+2}{Cu}$ ⑤O^2﹣⑥H₂O₂．

完形填空

    “I don't feel right about this,” I said to one of my cousins in a low voice. She nodded in 1 . Not wanting to be the first to touch the food, I waited for one of the older adults to start.

    Thanksgiving usually meant 2  and full stomachs, however, this year was 3. My family sat around the dinner table 4 at our feast. Everyone had a full plate, everyone except for Grandma. The treatment for throat cancer would 5  one of her great pleasures, eating. This was the first 6of many food-focused 7  to come. I could not imagine what it would be like to never taste food again. My cousin Molly broke the 8 with a raise of her glass, “To Nat.” We all followed her lead. “Your 9 and strength encourage us all,” she continued. Grandma smiled, holding back her tears with great 10 . “Thank you. Please, please eat.” And with that, we all began to eat. Conversation broke 11around the room while Grandma laughed and talked with us all. Cancer would take away her ability to eat, but not the gift of being the best hostess. The evening went on as 12 Thanksgivings do. By the time the night was over, I felt 13 to my family than ever before. I learned that we gather together on holidays not to eat rich feast, but to 14 and share with one another. We 15 my Grandmother's courage, but we all learned a lesson in grace. In the years following, my Grandma 16 to create meals for family events. She told me once with a laugh, “I may not be able to eat, but I can 17 taste things.” With a 18 heart, Grandma prepared what she could not have for the only purpose of making us 19 . She inspired me to learn to cook and helped me find the 20 to make everything come together: love.

“春蚕到死丝方尽”是古人的误解．其实，蚕吐尽丝时并未死亡，只是发育成不吃不动的（　　）