问题
选择题
蒸熟的馒头和面包暄软多孔，是因为在和面时在面粉中加入了（ ）
A．乳酸菌
B．青霉菌
C．枯草杆菌
D．酵母菌
答案
做馒头或面包时，经常要用到酵母菌，酵母菌经过发酵可以分解面粉中的葡萄糖，产生二氧化碳，二氧化碳是气体，遇热膨胀而形成小孔，使得馒头或面包暄软多孔．可见D符合题意．
故选：D
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蒸熟的馒头和面包暄软多孔，是因为在和面时在面粉中加入了（ ）
A．乳酸菌
B．青霉菌
C．枯草杆菌
D．酵母菌
做馒头或面包时，经常要用到酵母菌，酵母菌经过发酵可以分解面粉中的葡萄糖，产生二氧化碳，二氧化碳是气体，遇热膨胀而形成小孔，使得馒头或面包暄软多孔．可见D符合题意．
故选：D
完形填空 When I was in Grade Three, I was chosen to the heroine in the school play. For weeks my mother helped me 1 my lines(台词), But once on stage. Every word disappeared 2 my head. My teacher asked me to change 3 and be the narrator. Although I didn’t tell my mother 4 had happened that day, she 5 my unhappiness and asked if I wanted to take a walk in the yard. It was a lovely 6 day. It was warm. In the yard all the flowers came out. We could see lots of dandelions dancing among the colorful flowers. How beautiful they were! I watched my mother carelessly bend down by some flowers. “I think I am going to 7 all the useless grass. ” She said. “But I like dandelions,” I said, “All flowers are 8 — even dandelions”. My mother looked at me 9 . “Yes, every flower shines in its own way, doesn’t it?” she said. I nodded. “So that is 10 of people, too. ” She added. She had guessed my 11 . I started to cry and told her the truth. “You will be a great narrator. ” She said. Then she told me 12 I loved to read stories to her when I was in Grade 1. Over the next few 13 I learned to take pride in the role. The big day finally 14 . A few minutes before the play, my teacher came over to me. “Your mother asked me to give this to you,” she said, passing me a dandelion. After the play, I took the flower home, laughing that I was perhaps 15 person who would keep such a common dandelion.
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