4岁男孩，生后半年出现发绀，哭闹时加重，喜蹲踞。胸骨左缘第3肋_爱下问搜题

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问题单项选择题

4岁男孩，生后半年出现发绀，哭闹时加重，喜蹲踞。胸骨左缘第3肋间可闻及Ⅱ级收缩期杂音，P减弱，有杵状指。最可能的诊断是（）

A.房间隔缺损

B.室间隔缺损

C.法乐四联症

D.风湿性心脏病

E.动脉导管未闭

答案

参考答案：C

解析：此题考核法乐四联症的临床表现。法乐四联症典型的症状为自幼出现进行性发绀，哭闹时加重，常取蹲踞位。体征有发绀及杵状指（趾），胸骨左缘第2～3肋间闻及收缩期杂音，肺动脉第二音减弱。此病例符合上述特点，故选择C。

填空题

（6分）请回答下面问题

（1）Mg是第三周期元素，该周期部分元素氟化物的熔点见下表：

氟化物	NaF	MgF₂	SiF₄
熔点/K	1266	1534	183

解释表中氟化物熔点差异的原因：

。

（2）CO的结构可表示为C≡O，N₂的结构可表示为N≡N。下表是两者的键能数据：（单位：kJ·mol^-1）

	C－O	C=O	C≡O
CO	357．7	798．9	1071．9
	N－N	N=N	N≡N
N₂	154．8	418．4	941．7

CO与N₂的结构相似，分子中都含有共价三键，其中含有个π键；结合数据说明CO比N₂活泼的原因：

。

完形填空

One of my fondest memories as a child is going by the river and sitting idly on the bank. There I would   16  the peace and quiet, watch the water rush   17  and listen to the singing of birds and the rustling of   18  in the trees. I would also watch the bamboo trees   19  under pressure from the wind and watch them   20  gracefully to their original position after the wind had   21  .
When I think about the bamboo tree's ability to bounce back to its original position, the word "resilience" comes to mind. When used in   22  to a person this word means the ability to readily   23  from shock, depression or any other situation that stretches the limits of a person's   24  .
Have you ever felt like you are at your   25  point? Thankfully, you have survived the experience to live to talk about it.
During the   26  you probably felt a mix of emotions that threatened your health. You felt emotionally drained,   27  exhausted and you most likely stood   28   physical symptoms.
Life is a   29  of good times and bad times, happy moments and unhappy moments. The next time you are experiencing one of those bad times or unhappy   30   that take you close to your breaking point, bend,   31   don't break. Try your best not to let the situation get the best of you.
A   32  of hope will take you through the unpleasant ordeal (考验). With   33   for a better tomorrow or a better situation, things may not be as bad as they seem to be. The unpleasant ordeal may be easier to   34  if the final result is worth having.
If life gets   35  and you are at your breaking point, show resilience. Like the bamboo tree, bend, but don't break!

C．reference to

B．unreasonable

C．imagination