单项选择题

According to the passage, any vacations from thinking should be taken()

A. several times throughout the year
B. during spring and fall
C. during the summer
D. as seldom as possible

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单项选择题
In which case mentioned in the passage would an automatic language translator be helpful（）

A．A medical emergency．
B．Police action．
C．Traveling．
D．All of the above．
单项选择题
25()

A.time 
B.period 
C.length 
D.long
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