单项选择题

The sensation of a "lump in one's throat " arises from an increased flow of blood into the tissues of the pharynx and larynx.

A．explanation
B．disease
C．feeling
D．unpleasantness
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Cameras take the sharpest pictures when they are held still.
A．clearest
B．fastest
C．most interesting
D．most beautiful
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If wool is submerged in hot water, it tends to shrink.
A．smell
B．fade
C．unravel
D．contract
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