单项选择题

While typing, Helen has a habit of stopping ______ to stroke her long and flowing hair.

A．occasionally
B．simultaneously
C．eventually
D．endeavours
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单项选择题
This is the ______ piano on which the composer created some of his greatest works.
A．true
B．original
C．real
D．genuine
单项选择题
Of the thousands of known volcanoes in the world, the ______ majority are inactive.
A．tremendous
B．demanding
C．intensive
D．overwhelming
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