单项选择题

A．The causes are obvious.
B．The causes are very complicated.
C．Tile causes are familiar.
D．The causes are not well understood.
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单项选择题
A．They have electricity and hot water.B．They don’t have electricity and hot water.C．They’re like houses on wheels.D．They’re pulled behind the cars.
A．They have electricity and hot water.
B．They don’t have electricity and hot water.
C．They’re like houses on wheels.
D．They’re pulled behind the cars.
单项选择题
A．Checked them out.B．Took notes on them.C．Returned them to the shelves.D．Put them in his book-bag.
A．Checked them out.
B．Took notes on them.
C．Returned them to the shelves.
D．Put them in his book-bag.
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