单项选择题

A．The causes are familiar.
B．The causes are not well understood.
C．The causes are obvious.
D．The causes are very complicated.
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单项选择题
A．They set off early.B．They wait for a fine day.C．They go sightseeing.D．They go to the seaside.
A．They set off early.
B．They wait for a fine day.
C．They go sightseeing.
D．They go to the seaside.
单项选择题
A．A bookshelf.B．A typewriter.C．Some stocks.D．High quality paper.
A．A bookshelf.
B．A typewriter.
C．Some stocks.
D．High quality paper.
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