（山东实验一次诊断模拟）While there are quite a few differences in the education systems in many countries, education is ________.A.usualB.regularC.normalD.universal
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D解析句意：虽然在许多国家教育体制有很多不同，但是教育本身是一致的。usual--customary符合习惯的；regular有规则的；normal符合标准的；universal--belonging to, affecting or done by all people or things in the world or in a particular group全体的、影响全体的、全体做的、共同的。