单选题:It was not the first time he __________. I think it's high t

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It was not the first time he __________. I think it's high time we __________ to take him seriously. A.take us in... begin
B.had taken us in... began
C.has taken us in... began
D.took us in... begin

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Bit by bit, a child makes the necessary changes to make his

Bit by bit, a child makes the necessary changes to make his language __________A

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紧张性收缩的作用是 (  )

紧张性收缩的作用是 (  ) A.扩大胃的贮纳容量 A.扩大胃的贮纳容量 B.研磨、搅拌及推进食物 B.研磨、搅拌及推进食物 C.保持

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对胃酸作用叙述,错误的是 (  )

对胃酸作用叙述,错误的是 (  ) A.可激活胃蛋白酶原,提供其所需的酸性环境;并使蛋白质变性 A.可激活胃蛋白酶原,提供其所需的酸性

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一辆5 t载重汽车开上一个坡路,坡路长s=100 m,坡顶和坡底的高度差h=10 m,汽车上坡前的速度是10 m/s,上

一辆5 t载重汽车开上一个坡路,坡路长s=100 m,坡顶和坡底的高度差h=10 m,汽车上坡前的速度是10 m/s,上到坡顶时减为5.0 m/s,汽车受到的摩

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正确答案是(  )

正确答案是(  )A.assist B.track C.sustain D.dismiss

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