单项选择题


A．economies
B．nations
C．markets
D．products
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单项选择题
A．possibleB．desiredC．availableD．sufficient
A．possible
B．desired
C．available
D．sufficient
单项选择题
According to the passage, the main problem about night work is that______.
A．people hate the inconvenience of working on night shifts
B．your life is disturbed by changing from day to night routines and back
C．not all industries work at the same hours
D．it is difficult to find a corps of good night workers
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