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【单选题】
二尖瓣重度狭窄A.
二尖瓣口面积（4～6）cm2
B.
二尖瓣口面积≥2 cm2
C.
二尖瓣口面积≤1 cm2
D.
肺毛细血管楔压>30mmHg
E.
肺毛细血管楔压>20mmHg
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A.
groaned
B.
collided
C.
crashed
D.
grieved
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A.
tells
B.
is always telling
C.
has told
D.
always told
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A.
washes, washes
B.
washes, is going to wash
C.
washed, washes
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A.
had taken
B.
took
C.
would take
D.
should take
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A.
keep; dressed
B.
kept; dressing
C.
keeps; dressing
D.
keeps; dressed
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