下列各组词语中，字形和划线字的读音都正确的一组是（     ）

甘肃省黄河流域地表水年可取水量为48.3亿立方米左右。白龙江是嘉陵江上游最大的支流，在甘肃省境内河流长475千米，流域多年平均自产水资源量为69.1亿立方米。读“陇东跨流域调水路线示意图”，回答下列各题。

用所给动词的适当形式填空。
(1)He____ (prefer) outdoor activities to films last year.
(2)No country ____ (make) such great progress as China in the past thirty years
(3) I called you this morning, but nobody answered it. Oh, I ____ (iron) shirts in the bedroom.
(4)We should prevent air pollution ____ (live) a happier life.
(5)We hope that more charity shows ____ (hold) to raise money for Project Hope.

两圆$C_{1:x^2+y^2-1=0}$和$C_{2::x^2+y^2-4x-5=0}$的位置关系是（   ）

生物体结构和功能相适应的实例很多，下列表述不正确的是（　　）