【C6】A．orderedB．askedC．insistedD．required

A．insistingB．perseveringC．persistingD．requiring

【C13】A．orderedB．askedC．putD．required

A．askedB．bornC．meantD．required

【C17】A．RequireB．RequiringC．To RequireD．Required

黄酮类化合物的基本骨架是A．C3-C6-C6B．C6-C3-C6C．C6-C6-C6D．C3-C6-C3E．C6-C6-C3

【C9】A．likedB．askedC．hadD．wanted