单项选择题

According to the passage, some managers don't have to do any letter writing because __________.

A．they rely on quick notes
B．they have excellent secretaries
C．they have a computer to do it
D．they prefer making phone calls
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单项选择题
What are involved in the design of a new tool according to the passage
A．Electronic instruments and a regular tool.
B．A human "guinea pig" and a regular tool.
C．Electronic instruments and a human "guinea pig".
D．Electronic instruments, a human "guinea pig" and a regular tool.
单项选择题
What is the passage mainly about
A．The random fluctuation.
B．The function of feedback.
C．The transformation process.
D．The investment in all forms in the production.
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