问题
单项选择题
刚形成尚未钙化的牙本质是
A．小管周牙本质
B．小管间牙本质
C．小球间牙本质
D．前期牙本质
E．骨样牙本质
答案
参考答案：D
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刚形成尚未钙化的牙本质是
A．小管周牙本质
B．小管间牙本质
C．小球间牙本质
D．前期牙本质
E．骨样牙本质
参考答案：D
I used to live selfishly, I should admit. But one moment changed me. I was on my lunch break and had 41 the office to get something to eat . On the way, I 42 a busker (街头艺人)，with a hat in front of him. I had some 43 in my pocket, but I would not give them to him, thinking to myself he would 44 use the money to feed his addiction to drugs or alcohol. He 45 like that type---young and ragged. 46 what was I going to spend the money on ? Only to feed my addiction to Coca-Cola or chocolate! I then 47 I had no right to place myself above 48 just because he was busking. I 49 and dropped all the coins into his 50 , and he smiled at me. I watched for a while. As 51 as it sounds, I expected something more to come from that moment—a feeling of 52 or satisfaction, for example. But nothing happened. 53 , I walked off. “It proved to be a waste of 54 ,” I thought. On my way home at the end of the 55 , I saw the busker again and he was _56 . I watched him pick up the hat and walk 57 a cafe counter. There he poured the 58 contents into a tin collecting 59 an earthquake fund-raising (募捐) event. He was busking for charity! Now I donate any 60 I have to charity tins and enjoy the feeling of giving.
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