【C20】A．helplessB．aimlessC．unfocusedD．undecided

【C20】A．elevatedB．mercifulC．contentedD．grateful

【C20】A．communicateB．conveyC．transformD．translate

【C20】A．moreoverB．howeverC．thereforeD．furthermore

【C20】A．considerableB．consideringC．consideredD．considerate

【C20】A．shakingB．noddingC．shookD．/

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