单项选择题

Brushing removes larger particles, but dentists suggest brushing the back of the tongue as well, where food residues and bacteria ______.

A．flourish
B．collaborate
C．embark
D．congregate
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单项选择题
Some of the plan's provisions have already aroused opposition, most notably from Pope John Paul Ⅱ.
A．clauses
B．interpretations
C．interrelations
D．depreciations
单项选择题
Most of the 33 newly discovered planets' giant gas bags swing so erratically that they create havoc on any smaller, nearby, life-friendly planets.
A．destruction
B．benefits
C．chaos
D．violence
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