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【单选题】
如图甲所示,开关S接通后又迅速断开,电流计指针由中央向右偏后再回到中央,当把一个线圈和这个电流计按如图乙所示串联起来后,将一个条形磁铁插入或拔出线圈时,线圈中会产生感应电流。经观察发现,电流计指针由中央位置向左偏,这说明A.
图乙中的感应电流是从电流计的“+”接线柱流入的
B.
图线圈内感应电流产生的磁场方向向上
C.
如果磁铁的下端是N极,则磁铁正在远离线圈
D.
如果磁铁的下端是S极,则磁铁正在远离线圈
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举一反三
【单选题】_ people went to the concert which was held in People's Square _ the night of May Day. [ ]
A.
Thousands of; in
B.
Thousand; on
C.
Many thousand; in
D.
Thousands of；on
【单选题】By saying that 'people who held this view attempted to reverse the orthodox view' (in paragraph 1), the author means that those people______.
A.
didn't quite agree to the 'orthodox' view
B.
held an opposite view to the 'orthodox' one
C.
considered the 'orthodox' view unworthy of notice
D.
were faithful supporters of the Soviet foreign policies
【单选题】The government held a special meeting，________ people to contribute more to the victims.
A.
appealing
B.
appealing to
C.
to appeal
D.
to appeal to
【单选题】The 2012 Olympic Games ________ in London appealed to a lot of people across the world.
A.
held
B.
to hold
C.
being held
D.
to be held
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