【C18】A．forgotB．refusedC．returnedD．preferred

A．appointB．specifyC．assignD．prefer

A．hateB．dislikeC．likeD．prefer

【C2】A．priorB．primitiveC．primaryD．preferable

Some students prefer to study alone. Others prefer to study with a group of students. Whic

【C8】A．deniedB．refusedC．lostD．deprived

下列物质中 ( )是目前已经肯定的必需脂肪酸。A C16:2B C18:2C C18:3D C20:3(E)C20:4