题目

Surprising Health Benefits of Staying Hydrated( 保湿)How much water you need to consume on a daily basis depends on several factors, including your weight, the climate where you live and how often you exercise. The clearest sign that you’re adequately hydrated is transparent yellow or pale urine(尿液).【1】 The basic amount of water we need a day is eight 250-millilitre glasses and you should drink no less than that. If you are properly staying hydrated, these four positive health results should follow.Give you more energy and strength【2】Water helps your muscles maintain the right 已知抛物线y=ax2+bx+c的开口向下，顶点坐标为（2，-3），那么该抛物线有（ ）A．最小值-3B．最大值-3C．最小值2D．最大值2