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【单选题】
如图甲所示，理想变压器原、副线圈的匝数比为2∶1，电阻55Ω，电流表、电压表均为理想电表。原线圈A、B端接入如图乙所示的正弦交流电压，下列说法正确的是( )【图片】A.
电流表的示数为 4.0A
B.
电压表的示数为 155.6V
C.
副线圈中交流电的频率为 50Hz
D.
穿过原、副线圈磁通量的变化率之比为 2∶1
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举一反三
【单选题】People all over the world write to Big Ben. They【C1】______send birthday presents. Big Ben is not a【C2】______. It's a clock! Big Ben is the great clock【C3】______up in a tower of the Parliament building...
A.
once
B.
usually
C.
ever
D.
even
【简答题】（）提出了“诗是强烈情感的自然流露”的著名观点。
【单选题】From the first paragraph we can see that ______.
A.
Big Ben was made in 1956
B.
Big Ben had been silent many times
C.
the bells stopped ringing for two days
D.
Big Ben had been working well since 1956
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