以下不是光固化复合树脂修复适应证（ ）
A. 中龋
B. 氟斑牙
C. 前牙间隙过宽
D. 残根
______every magnet is surrounded by a magnetic field.
A. It is believed that
B. It believes that
C. It believed that
D. It's believing that
______I have made no arrangements to deal with such cases.
A. It appear that
B. That appears
C. They appear that
D. It appears that
______ that the first cheese was probably made more than 4000 years ago by nomadic tribes in Asia.
A. The belief
B. Although they believe
C. It is believed
D. Believing
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