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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The year of 776 B. C. is considered to be the founding date of the Olympic Games in ancient Greece. The Games lasted more than 11 centuries ______ they were banned in 393 A. D.
A．when
B．after
C．as
D．until
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This is an alarming realization as natural resources and the environment are being degraded and ______ at a record pace.
A．wasted
B．reconstructed
C．destructed
D．reversed
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