问题
选择题
____ __ is known to us all that 2012 Olympic Games will take place in Britain．[ ]
A. It
B. As
C. Which
D. What
答案
答案：A
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____ __ is known to us all that 2012 Olympic Games will take place in Britain．[ ]
A. It
B. As
C. Which
D. What
答案：A
釉质表面窝状缺损，呈棕褐色，无松动，探坚硬粗涩感。患者幼儿期曾患高热性疾病。
垫防止过度磨损