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【单选题】
人类听觉的适宜刺激是频率( )赫兹的声波A.
200~20000
B.
1000~4000
C.
16~20000
D.
1000~5000
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皮皮学刷刷变学霸
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【单选题】Why do we call the sun'a life－giving star'?A． Because it gives us warmth．B． Because
A.
25． Why do we call the sun'a life-giving star'? A． Because it gives us warmth．
B.
Because there are some living things on it．
C.
Because plants and animals can't live without it．
D.
Because people have to live in the dark without it．
【单选题】A long-term study of 136 pairs of twins showed that ______.
A.
they lost a little ability to reason over the years
B.
the only factor which declined over the years was their speed with which to perform. mental tasks
C.
their memory was not as good as it had once been
D.
their minds became a bit more active as they grew older
【单选题】The passage states that information can be lost from short-term memory when a person
A.
does not know how to read
B.
repeats the information over and over
C.
processes the information further
D.
is distracted for 20 seconds
【单选题】一个小球被系在细绳上，在竖直面内做圆周运动。以下关于其运动的说法中正确的是
A.
该小球在任意时刻的切向加速度都不为零
B.
该小球在任意时刻的法向加速度都不为零
C.
绳子对小球的拉力以及小球受到的重力是惯性离心力的反作用力
D.
绳子对小球的拉力与小球所受重力的合力是惯性离心力的反作用力
【单选题】---We are late because we took _______ wrong road. ---You should be careful ______ next time.
A.
the…the
B.
a…the
C.
the…/
D.
/…/
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