单项选择题

"Sleep fragmentation" refers to a marked lack of "REM" sleep.（）

A、Right
B、Wrong
C、Not mentioned

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单项选择题
The survey was focused on（）

A．the living conditions of older physicians in the U.S.
B．the career plans of older physicians in the U.S.
C．the retirement plans of older physicians in the U.S.
D．the achievements of older physicians in the U.S.
单项选择题
a person of high intelligence will probably score（）

A．above 110 on an IQ test
B．110 on an IQ test
C．90 on an IQ test
D．below 75 on an IQ test
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