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【多选题】
下列哪些器官或组织存在屏障系统,会影响外源物质的分布 ( )A.
卵巢
B.
睾丸
C.
大脑
D.
眼睛
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皮皮学刷刷变学霸
举一反三
【单选题】Everyone in the class is expected to________in the discussion.
A.
participate
B.
attend
C.
donate
D.
declare
【简答题】The students often have (heat) ___________ discussion in the class.
【单选题】关于磁感线，正确的说法是（ ）
A.
用磁感线可以形象地表示磁场的方向和它的强弱分布
B.
磁感线是磁场中真实存在的线
C.
磁铁外部的磁感线是从磁铁的南极出来，回到它的北极
D.
在磁场中，画出一条条曲线，这些曲线就叫磁感线
【单选题】听力原文：M: Professor White is really into class discussion. Almost in every of his class he would organize class discussion. To be honest, I'm fed up with it. W: Really? Don't you feel it enjoyable and q...
A.
It wastes time.
B.
It is enjoyable.
C.
It benefits the class.
D.
It is good but needs improving.
【简答题】磁感线可以形象地表示磁场的_______和它的______情况，磁体外部的磁感线是从它的______极出来，回到它的______极。
【单选题】What are the students doing when the man arrives in the class?
A.
Having a class discussion.
B.
Giving presentations.
C.
Drawing graphs.
D.
Taking an exam.
【简答题】磁感线可以形象地表示磁场的______和它的______情况，磁体外部的磁感线是从它的______极出来，回到它的______极．
【简答题】A．The man and the woman have the same opinion about the class discussion. B．It is usually too noisy to bear the class discussion C．Many students pay no attention to the class discussion. D．Some studen...
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