We must ______an overall plan.
A. draw out
B. draw into
C. draw back
D. draw up
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The firm_____ from fulfilling its agreement.
A. drew into
B. drew back
C. drew out
D. drew up
Please allow me to ______myself first.
A. introduction
B. reproduce
C. introduce
D. produce
The school of ________and management of Harvard is among the best ones all over the world.
A. economy
B. economic
C. economical
D. economics
下列哪项不是固有免疫系统的组成成分
A. 组织屏障
B. 固有免疫细胞
C. 固有免疫分子
D. T淋巴细胞