温庭筠其诗辞藻华丽，秾艳精致。其词艺术成就在晚唐诸词人之上，为“____派”首要词人。本词中“脉脉”“悠悠”有着怎样的表达效果？请简要分析。____
基因突变和染色体变异是真核生物可遗传变异的两种来源．回答下列问题：
在极坐标系下，圆C：ρ2+4ρsinθ+3=0的圆心坐标为（ ）
______ birds use their feathers for flight, some of their feathers are for other purposes.
- Excuse me. Do you know __________?
- Well, go along this street and turn right. There’s one on the left.
