美国高中课程设置分为核心课程（core subjects）和选修课程（elective subjects）；核心课程即必修课，包括语言艺术（包括阅读，写作和文学）， 数学，科学（包括 化学、生物和 物理），社会学（包括 历史，地理...
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Four or five elective subjects 四门选修课
Core & Elective Subjects 必修及选修科目
Core and Elective Subjects 必修及选修科目
Elective e Subjects 选修课程
Elective subjects applied science, music, art and foreign languages.
选修科目有应用科学、音乐、美术和外语。
However, after elective subjects appearing in college entrance examination, a new kind of unfairness occurs when applying the standardized score to calculate total scores.
但高考出现选考科目以后，采用通常的标准分又引发了新的不公平现象。
Methods A L-form bacteriological study was made on 130 patients undergoing elective surgery for gallbladder diseases and 20 subjects with a normal biliary tract as a control group.
方法应用高渗培养技术对130例胆囊结石、胆囊炎及20例非胆道疾病的患者胆囊胆汁标本进行普通菌及L型菌联合培养。
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