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问题 单项选择题

下列哪项与毒性甲状腺肿的声像图无关 （ ）

A．甲状腺火海征

B．甲状腺海岛征

C．甲状腺上下动脉增宽

D．甲状腺上下动脉为高阻高速频谱，峰值速度>70cm/s，静脉为低速宽带频谱

E．血流速度的增加随T3、T4的升高而加快

答案

参考答案：D

阅读理解

  The students were having their chemistry（化学）class. Miss Li was telling the children what water was like. After that, she asked her students, “What’s water?” No one spoke for a few minutes．Miss Li asked again，“Why don’t you answer my question？Didn’t I tell you what water is like？”

Just then a boy put up his hand and said，“Miss Li，you told us that water has no color and no smell．But where to find such kind of water？The water in the river behind my house is always black and it has a bad smell．”Most of the children agreed With him．

“I’m sorry，children．”said the teacher，“Our water is getting dirtier and dirtier．That’s a problem”．

小题1:The students were having their _______ class．

A．English

B．Chinese

C．chemistry

D．math小题2:Miss Li was telling the children what ______ was like．

A．water

B．air

C．earth

D．weather小题3:A boy said，“The water in the river behind my house is always ___．”

A．white

B．black

C．clean

D．clear小题4:Most of the children _______ the boy．

A．agreed with

B．wrote to

C．heard from

D．sent for
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单项选择题

液体在圆形管路中稳定流动，当体积流量不变管径缩小一倍时，其流速是原流速的（）倍。

A、4倍

B、2倍

C、2.5倍

D、1.75倍
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