Who running Jim or Jack? A. is good at B. is better at C. is the best

问题补充：

Who running, Jim or Jack?

A. is good at B. is better at C. is the best

答案：

解析：考查比较级的用法。句意“谁更擅长跑步，吉姆还是杰克？”根据所给范围是两者可知，应该用比较级。be good at“擅长......”；good的比较级是本田特热。故选B。