单项选择题

What is most likely to cause insufficient suction in a vacuum cleaner

A．The dust bag is full.
B．The hoses are clogged by dirt.
C．The speed of the fan's whirring is too low.
D．The fan chamber is too small.
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单项选择题
According to the passage, the place where Dante died is ______.
A．Sicily
B．Florence
C．Rome
D．not known
单项选择题
The earliest work from Northern Europe is ______.
A．The Romance of the Rose
B．The Song of Roland
C．Beowulf
D．Ballads of Robin Hood
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