题目

Welcome to SummerCamps.com; find and book the very best summer camps. Your children are precious so we offer the highest quality of camps that will meet each child’s needs and interests.Catalina Sea CampSea Camp offers three one-week sessions to boys and girls aged 8-13 and two three-week sessions to teens aged 12-17. Our hand-picked instructors create an atmosphere of fun and excitement while leading campers to a host of ocean adventures, marine(海洋的) biology, and social summer camp activities.Address: Toyon Way, San Bruno, California 94066Phone: 800-645-1423Camp CayugaCamp Cayuga is a（07年上海卷）如图所示，一定质量的空气被水银封闭在静置于竖直平面的U型玻璃管内，右管上端开口且足够长，右管内水银面比左管内水银面高h，能使h变大的原因是（        ）（A）环境温度升高。 （B）大气压强升高。（C）沿管壁向右管内加水银。  （D）U型玻璃管自由下落。