As we all know，a knowledge of statistics is required for the analysis of data.A)正如

A.ever know

B.ever knew

C.have ever known

D.are knowing

______ we all know, air is gas.

A.As

B.Which

C.That

D.What

We all know that the plan is divided into three parts. (翻译)

A.it is known to all

B.we all know that

C.it is know to all that

D.as is known to all

As we all know, fresh air is ______ to our health. (benefit)

A.English

B.Business English

C.language

D.Chinese

A.at

B.from

C.in

D.with

A.movements

B.performances

C.operations

D.actions

A.pleasant

B.please

C.pleasing

D.pleased