Immigrantshavetoadaptthemselvesculturallyandphysicallytothenewsurroundings____theyhavemove.
A. onwhich
B. bywhich
C. intowhich
D. fromwhich
________ in the company for three years, Mark has become experienced in business negotiations.
A. Worked
B. Have been working
C) Have worked
D. Having worked
人与病原生物间的关系主要表现为（）
A. 共生
B. 寄生
C. 拮抗
D. 捕食
E. 共栖
临床上常用于血清的除菌的方法是（）
A. 滤过除菌法
B. 紫外线照射法
C. 高压蒸汽灭菌法
D. 巴氏消毒法
E. 煮沸法
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