决定抗原特异性的是A. 完全抗原B. 共同抗原C. 抗原决定簇D. 胸腺依

A．Cloud computing and big data

B．Personal computers and Internet

C．Globalization and ever-changing international market

D．World Wide Web

What has affluence brought to American society？

A) Renewed economic security.

B) A sense of self-fulfillment.

C) New conflicts and complaints.

D) Misery and anti-social behavior.

What are some of the more astonishing innovations in modern surgery？

A．Ears, nose and throat transplants.

B．Valves plastic hearts.

C．Plastic heart valves.

D．Leg transplants.

A．A.Information sharing

B．B.Network innovations

C．C.Rapid business transactions

D．D.All of the above

What will the woman do next？

A．She will leave.

B．She will stay.

C．She will drive herself.

What has ___ the rethinking in action is the emergence of the two –tier economy.

A、 put

B、 token

C、 brought

D、 set

What does the man offer to do？

A．To download some files

B．To drive the woman home

C．To order food for delivery

D．To make corrections to a document

What does the word "outlay" in the last sentence mean？

A．Less profit.

B．Money spent for a purpose.

C．More profit

D．No profit.

What is the main purpose of the lecture？

A．To discuss recent innovations in laboratory equipment

B．To give an example of a practical use for a particular scientific technique

C．To familiarize students with the chemical composition of paint pigments

D．To show how researchers were able to restore a particular work of art