单项选择题

A．Their performance may improve.
B．Their immune system may be reinforced
C．Their blood pressure may rise all of a sudden.
D．Their physical development may be enhanced.
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单项选择题
A．The air becomes still. B．The air pressure is low. C．The clouds block the sun. D．The sky appears brighter.
A．The air becomes still.
B．The air pressure is low.
C．The clouds block the sun.
D．The sky appears brighter.
单项选择题
A．They often feel insecure about their jobs. B．They are unable to decide what to do first. C．They are incompetent to fulfill their responsibilities. D．They feel burdened with numerous tasks every day.
A．They often feel insecure about their jobs.
B．They are unable to decide what to do first.
C．They are incompetent to fulfill their responsibilities.
D．They feel burdened with numerous tasks every day.
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