改革开放30多年来，我国的生产发展，取得了巨大成就。居民生活水平也发生了深刻变化，可谓“步步登高”。其重要原因是始终把发展作为党执政兴国的第一要务，强调“聚精会神搞建设，一心一意谋发展”。结合图片所示内容回答：
（1）我们为什么要“聚精会神搞建设，一心一意谋发展”？
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（2）怎样使我国经济又好又快发展？
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