消化性溃疡发生的决定因素是（）

A.胃蛋白酶

B.胆盐

C.乙醇

D.胃酸

E.非甾体类药物

The Internet is a (66) network of networks which interconnects (67) ranging from the simplest personal computers to the most sophisticated mainframes and supercomputers. This network of networks is used for an extraordinary range of purposes - long distance collaborations, retrieving free software and documents, (68) library catalogs, (69) in t6 supercomputers - the list of current Internet activities and (70) is large and the range of possible future applications is as unlimited as our imagination.

A．logging

B．going

C．coming

D．achieving