问题
单项选择题
患儿，4岁，发现心脏杂音全身青紫3年半，活动后突然晕厥抽搐。听诊胸骨左缘第3肋间Ⅱ级收缩期杂音，肺动脉第2音减弱。
晕厥的原因考虑为（）
A．癫痫发作
B．缺氧发作
C．脑栓塞
D．脑脓肿
E．化脓性脑膜炎
答案
参考答案：B
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患儿，4岁，发现心脏杂音全身青紫3年半，活动后突然晕厥抽搐。听诊胸骨左缘第3肋间Ⅱ级收缩期杂音，肺动脉第2音减弱。
晕厥的原因考虑为（）
A．癫痫发作
B．缺氧发作
C．脑栓塞
D．脑脓肿
E．化脓性脑膜炎
参考答案：B
Are you ____ about how to study and make your study more effective(有效率的)? We all know that some students usually study very hard for a long ___. This is very good, but it doesn’t ___a lot, for an effective student must have enough sleep, enough food and enough rest and exercise. Every day you need to go out for a walk or visit some friends or some nice places. It’s ____ for your study. When you return ____ your studies, your mind will be refreshed and you’ll learn more ____ study better. Psychologists(心理学家)__ __ that learning takes place this way. Here take English learning as an example. First you make a lot of progress and you will feel happy. Then your language seems to stay the same. So you will think you are learning ____ and you may give up. This can last for days or even weeks , yet you can’t give up. Later your language study will again take another big ____. You will see that you really have been learning all along. If you get enough sleep, food, rest and exercise, studying English can be very effective and ____. Don’t give up along the way. Learn slowly and you’re sure to get a good result.
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