【C20】A．pursuingB．purifyingC．pumpingD．punching

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

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

The ticket to know－it－all boy is punched "lean".（)

The ticket to Billy is punched "belief".（)

【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