单选题（）has been called the “cradle of American Liberty”.A PhiladelphiaB PlymouthC Boston

A.the Mississippi

B.the Missouri

C.the Hudson

D.the Ohio

The OSI(66)model, sometimes also called ISO or 7 layers reference model for communication, has been developed by the International Standards Organization in early 1980's.

A．referent

B．reference

C．referance

D．refering

●The OSI (68) model，sometimes also called ISO or 7 layers reference model for communication.has been developed by the International Standards Organization in early 1980's.

(68) A．referent

B．reference

C．referance

D．refering

If during discharging the Captain for fear of vessel being frozen in deems it advisable to leave， he has liberty to do so． This sentence says that ________ ．

A.fearing the vessel being frozen in the Captain has liberty to discharge the cargo

B.the vessel can stop discharging and leave the unloading port if the risk of being frozen in exists．

C.the Captain has liberty to leave the discharging port if there is no risk of being frozen in

D.the Captain deems it advisable to leave the discharging port

Output is data that has been processed into useful form. called(27). That is a computer processes input into output.

A．data

B．information

C．interface

D．system

Jean Wagner’s most enduring contribution to the study of Afro-American poetry is his insistence that it ____ in a religious, as well as worldly, frame. of reference.

[A]is to be analyzed

[B]has been analyzed

[C]be analyzed

[D]should have been analyzed

Many modern critics of American literature have called Mark Twain, born Samuel Clemens, ______.

A. as America's greatest writer

B. was America's greatest writer

C. America's greatest writer

D. to have been America's greatest writer