问题
单项选择题
月经周期正常的妇女，排卵约在()。
A．两次月经中间
B．下次月经前12天左右
C．下次月经前14天左右
D．本次月经净后14天左右
E．本次月经周期第14天左右
答案
参考答案：C
解析：[知识点] 卵巢的周期性变化及性激素的功能
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月经周期正常的妇女，排卵约在()。
A．两次月经中间
B．下次月经前12天左右
C．下次月经前14天左右
D．本次月经净后14天左右
E．本次月经周期第14天左右
参考答案：C
解析：[知识点] 卵巢的周期性变化及性激素的功能
Man began to make use of fire long long ago. Fire is useful in many ways, but sometimes it is dangerous. If you are not (1) with it, it can burn things or (2) hurt you. A big fire can (3) forests and tall buildings. Sometimes a piece of (4) paper can cause a big fire. So please remember (5) ______ in the dry places like woods and forests (6) throw a cigarette end on the grass and it’s also important for you to put the candles in the 7) place. When you use candles at home ,you should (8) your long hair away from the fire. But if there is a (9) in our building, what should we do with it? Pour some water (10) your clothes. What’s more, put a (11) towel (毛巾) over your mouth and your nose to keep the (12)______ out. You’d better run away from the fire as (13) as you can. But you mustn’t rush! Or you may fall over and hurt yourself or others. Of course you should also call 119. On the phone you should clearly tell the firemen (14) the fire is to help them get there without difficulty. By the way, Do not (15) out of the window. Jumping may be more dangerous than the fire. Keep ourselves away from fire and safety is above all!
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