单项选择题

A．The pilot’s concentration.
B．The efficiency of the local mobile phone network.
C．How long it takes passengers to get seated.
D．The navigational equipment of the plane.
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单项选择题
A．Brutal.B．Depressive.C．Humorous.D．Conservative.
A．Brutal.
B．Depressive.
C．Humorous.
D．Conservative.
单项选择题
A．Reduced perspiration.B．Reduced heart rate.C．Reduced stress.D．Improved immunity.
A．Reduced perspiration.
B．Reduced heart rate.
C．Reduced stress.
D．Improved immunity.
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