单项选择题


A．happy
B．excited
C．relaxed
D．bored
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单项选择题
In the experiment described in Paragraph 2, the video-watchers experienced downturn in the antibody because ______.
A．the video was not enjoyable at all
B．the outcome was beyond their control
C．the knew little about surgical procedures
D．they felt no pressure while watching the video
单项选择题
We can conclude from the study of the 158 nurses in 2001 that ______.
A．people under stress tend to have a poor memory
B．people who can't get their job done experience more stress
C．doing challenging work may be good for one's health
D．stress will weaken the body's defense against sperms
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