题目

For all the technological wonders of modem medicine, health care-with its fax machines and clipboards(写字板)—is out of date. This outdated era is slowly drawing to a close as the industry catches up with the artificial-intelligence ( AI) revolution.Eric Topol, an expert in heart disease and enthusiast for digital medicine, thinks AI will be particularly useful for such tasks as examining images, observing heart traces for abnormalities or turning doctors' words into patient records. It will be able to use masses of data to work out the best treatments, and improve workflows in hospitals.两数相加，其和小于每一个加数，那么（　　）A．这两个数相加一定有一个为零B．这两个加数一定都是负数C．这两个加数的符号一定相同D．这两个加数一正一负且负数的绝对值大