优生优育的措施包括____、提倡遗传咨询；产前诊断．

Apart from the urgent problems _____________by wars and conflicts, the UN helps countries with other problems such as lack of education ,lack of food , poverty ,disasters and disease.

已知Rt△ABC中，∠A=90°，则$\frac{b}{c}$是∠B的（　 　）

解释下列语句中加线词的意思。

或与人梦，或下谕巫祝，欲得啖童女年十二三者。____

然气厉不息。 ____

世界降水受纬度因素影响最明显的是（    ）