化合物和CH3O—CH2CHClCOOH的系统名称分别是()和().
参考答案:4-甲基-3-羟基苯乙酸;3-甲氧基-2-氯丙酸。
简述认知差异的教育含义。
38. Eric taught folk music in a local school for one year, ______ he spent some time abroad studying jazz.
A.after that
B.after which
C.after it
D.after this