维持蛋白质四级结构的驱动力不同于三级结构的维持力，四级结构的维系主要是亚基之间的-S-S-键。()
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"Expatriate workers" (Line 5, Para. 4) are those who______.
A. can't find jobs in their own countries
B. leave their countries to live and work abroad
C. have to leave their countries for all their life
D. are professionals in medicine, law and other professions
It was difficult to get Balintore away from the discussion with the crowd because
A. the crowd was composed of soldiers
Balintore was enjoying himself and the crowd was so excited
C. the crowd angrily refused to let Balintore go
D. Balintore stubbornly insisted on staying
What was NOT the reason for some Koreans being in Japan？
A. They were taken there as workers.
B. They were recruited into the army there.
C. They were served as "comfort women. "
D. They were demanded to fight against Japanese soldiers.
From the passage we can infer that______.
A. in most cases, it is cheaper for a company to hire workers in other countries
B. the United States has more international corporations than Japan and other countries combined
C. the U. S. automobile industry is collapsing under competitive pressure from Japan and other industrialized countries
D. professionals are easier to find a job abroad than workers
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