根据我国《保险法》的规定，投保人对保险标的应当具有保险利益。投保人对保险标的不具有保险利益的，保险合同无效。( )
参考答案：对
―How are things going?
―The disabled _______ no relatives in Guangzhou _______ by the volunteers, who will graduate from Zhongshan University next year.
A．with; are taking care of
B．have; will be taken care of
C．with; are being taken care of
D．have; are being taken care of
下列实验或现象能说明二氧化碳的密度比空气大的是 [ ]
A．二氧化碳不支持燃烧
B．二氧化碳通入紫色石蕊试液中，紫色石蕊试液变红
C．随着压强的增加，二氧化碳在水中溶解的量越多
D．充满空气的气球可以漂浮在二氧化碳气体中
