单项选择题

In the second paragraph, "rise up the career ladder" (Line 1) means（）.

A．going to work abroad
B．changing jobs frequently
C．being promoted in position
D．pursuing an advanced degree

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单项选择题

According to Aleem Walji, the company’s first project is to（）.

A．set up a new system to warn people of infectious diseases
B．find out where infectious diseases develop
C．identify the causes of infectious diseases
D．cure patients of infectious diseases

填空题

47（）