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【简答题】
如图所示电路中【图片】两点间的等效电阻【图片】（）欧姆。【图片】
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举一反三
【简答题】Jennie sat at her window as usual, looking out upon the street, with a look of sadness on her face,“What a long day this is going to be!” Then she saw a little boy running down the street, swinging hi...
【单选题】苯二氮卓类临床上取代了巴比妥类传统镇静催眠药的主要原因是
A.
苯二氮卓类对快波睡眠时间影响大
B.
苯二氮卓类可引起麻醉
C.
苯二氮卓类小剂量即可产生催眠作用
D.
苯二氮卓类有较好的抗焦虑、镇静作用,安全性好
【单选题】听力原文：M：Why is Susan looking upset? W：I had her play piano instead of going out to play. Q：Why is Susan looking unhappy? (3)
A.
Because her mother blamed her for not playing piano.
B.
Because she was not allowed to play piano.
C.
Because she had to play piano instead of going out to play.
D.
Because she was forced to go out.
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