Photoshop中BackgroundEraserTool（背景像皮擦工具)不受图层调板上锁定透明的影响,使用完背景像皮工具后,原来的背景图像自动转化为普通层。（)

A.background

B.backgrounglmage

C.image

D.background

A.informations

B. knowledge

C. background

D. information

My experience _________me that a background in pure science is an idealpreparation for doing business．

A．invited

B．persuaded

C．advised

D．convinced

In the third paragraph, the word "background" means " ______".

A．stage

B．condition

C．experience

D．setting

The theoretical linguistic background of the Audiolingual Method is______.

A．Latin grammar

B．Audiolingualism

C．Structuralism

D．generative-transformational grammar

A.setting

B.conditions

C.surroundings

D.background