单项选择题

The assassin hid himself carefully from view before ______ his future victim.

A．drawing from
B．drawing up
C．drawing with
D．drawing on
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单项选择题
The underwater listening system was originally desighed ______.
A．to trace and locate enemy vessels
B．to monitor deep-sea volcanic eruptions
C．to study the movement of ocean currents
D．to replace the global radio communications network
单项选择题
According ;to the researchers, which of the following factors affects cognitive aging
A．Education
B．Chronic illness
C．Standard of living
D．All of the above
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