斑贴试验的实质是（）。 A.Ⅰ型变态反应 B.刺激过敏反应 C.Ⅳ型变态反应 D.细

—Where is Mother?

—She is in the kitchen. She ______the housework all morning.

A． does

B．has been doing

C．has done

D．was doing

They did not find ________ to prepare for the worst conditions they might meet.

A．it worthy

B．it worthwhile

C．it worth

D．worth their while

脑血管狭窄的TCD表现是（）

A.狭窄段血流速度增快

B.狭窄远端血流速度减低

C.流速曲线图形异常（充填）

D.血管杂音

E.以上均是

古玩店的伙计常对瓷器“哈气”后再擦拭，这说明与空气相比人体呼出的气体中含有较多的[ ]

A．氧气

B．二氧化碳

C．水蒸气

D．无法确定

脑梗死

A．梗死灶呈节段状
B．贫血性梗死灶呈锥体状
C．出血性梗死灶呈锥体状
D．梗死灶呈地图状
E．梗死灶呈液化性坏死