2003年，Michael Grieves教授首次提出了“与物理产品等价的虚拟数字化表达概念”，数字孪生即由此概念衍生而出并沿用至今。下列是数字孪生简称的是：（）

A.Delight

B.Grieve (for)

C.Glory (in)

D.Joy

A.伤心

B.放松

C.拖延

D.重现

A．If you don't work hard in youth you will regret in old ageB．One who does not work hard in youth will grieve in vain in old ageC．have no idea

A.0

B.1

C.2

D.3

E.4

Michael is holding a ______position in the company and expects to be promoted soon.

A．minor

B．inferior

C．secondary

D．subordinate

A.RC4

B.AES

C.SMS4

D.Michael

Michael found it difficult to get his British jokes () to American audiences.

A、around

B、over

C、across

D、down

A.RC4

B.AES

C.SMS4

D.Michael