单项选择题
Rescue workers continued the delicate task of sifting through tons of concrete and to try to reach possible survivors.
A．scraps
B．leftovers
C．debris
D．residues
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单项选择题
The shortage of water became more ______ this summer with the highest temperatures in 40 years.
A．needy
B．latent
C．severe
D．dredge
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单项选择题
They tried to drive their horse into the river, but he simply could not ______.
A．budge
B．surge
C．trudge
D．dredge
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