下列哪项检查最适用于鉴别上颌或下颌急性牙髓炎
A．染色法B．X片检查C．麻醉试验D．电活力测验法E．以上都不对
参考答案：C
命题“互为邻补角的两个角的平分线相互垂直”的题设是______，结论是______．
They work day and night; however, _______ of the money they make goes to their so-called eldest brother.
A．four-fifth
B．four-fifths
C．four-five
D．four-fifths
