食管癌最好发的部位是
A. 颈段食管
B. 胸部上段食管
C. 胸部中段食管
D. 胸部下段食管
E. 腹部食管
It can be inferred that after September 11th more informers appeared because of their ___________.
A. being protected by the State's legislation
B. more care about personal safety
C. increasing patriotism towards their nation
D. being paid more for whistle blowing
将0.369、0.0035、0.18相加，其和应是
A. 0.5525
B. 0.552
C. 0.553
D. 0.55
E. 0.6
对牙周健康状况影响最大的不良习惯是
A. 吸烟
B. 喝酒
C. 磨牙症
D. 吐舌
E. 口呼吸
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