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【单选题】
关于电流和电源,下列说法正确的是 ( )A.
电路中只要有电源，就一定有电流
B.
电流是由电荷做无规则运动形成的
C.
在电源的外部，电流从电源的正极流向电源的负极
D.
金属导体中的电流方向与电子移动的房产相同
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举一反三
【单选题】The ground has been cleared and houses for those homeless people now.
A.
build
B.
have built
C.
are built
D.
are being built
【简答题】As we walk through the Hutongs, you may find most of them look almost ( ) with gray-colored walls and bricks. Actually inside those walls are the courtyard houses, where people live.
【简答题】They are tearing _____ those old houses to put up a new office building.
【单选题】Houses in the country are ____ than those in the city.
A.
much less expensive
B.
more expensive
C.
much more cheaper
D.
more cheaper
【简答题】Complete the following sentences by choosing the correct word from those given in brackets. 35. Old houses are often more comfortable than modern (one, ones, one's)
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