单项选择题

When hummingbirds fly, their wingbeats are so rapid that the wings seem blurred.

A．tiny
B．fragile
C．indistinct
D．inexhaustible
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单项选择题
The typical shoe of the Middle Ages was a soft, clinging moccasin that extended to the ankle.
A．close-fitting
B．comfortable
C．cleverly made
D．leather
单项选择题
After that sagging barn collapsed, the farmer burned it down.
A．burned it rapidly
B．burned it to the ground
C．burned it all
D．burned it out
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