单项选择题

A．Experimental medicines.
B．Special treatment centers.
C．Flexible working schedule.
D．Innovative physical exercises.
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单项选择题
A．Go to summer school.B．Take a vacation.C．Stay at home.D．Earn some money.
A．Go to summer school.
B．Take a vacation.
C．Stay at home.
D．Earn some money.
单项选择题
A．They make decisions by tossing coins.B．They are not physically separated.C．They think exactly the same way.D．They share most of their vital organs.
A．They make decisions by tossing coins.
B．They are not physically separated.
C．They think exactly the same way.
D．They share most of their vital organs.
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