胰腺癌与总胆管结石的主要鉴别点是A．进行性黄疸B．肝功能改变C．淀粉酶改变D．胆囊肿大E．皮肤瘙痒

A.didn't achieve

B.wasn't able to achieve

C.wouldn't have achieved

D.shouldn't have achieved

processes of inflection or derivation. go, goes, going, gone discover, discovery, discoverer, discoverable, discoverability (3)lovely, lovelier, loveliest inventor, inventors, inventors, inventors democracy, democrat, democratic, democratize

te _________________ into one huge global marketplace.

A.local markets

B.regional markets

C.national markets

D.international markets

One explanation given by scientists for the crop circles is that they are made by ______.

A．airplane crashes

B．new farming techniques

C．unknown flying objects

D．air movement

Scientists doubt whether it's______to regulate one's biological clock by drinking.

A．feasible

B．incredible

C．fashionable

D．valuable

Scientists doubt whether it's______to regulate one's biological clock by drinking.

A．feasible

B．incredible

C．fashionable

D．valuable

Scientists think laser (be) __________ one of the most useful tools today.

The scientists were _______ as they had found not one but three viruses.

A．advanced

B．excited

C．amazing

D．repenting