软件与系统不兼容引起的故障有（）
A、不能运行
B、系统死机
C、某些文件被改动和丢失
D、以上都是
参考答案：D
— at this season of the year in the north?
—It's much hotter than last year. The high temperature has lasted for days.
A. How are things going
B. How are you getting on
C. What's the weather like
D. What do you do
鱼类体内的危害因素如重金属、环境持续化合物等，它们的分布是有一定规律的（）。
A.肉食性鱼>杂食性鱼>草食性鱼
B.草食性鱼>杂食性鱼>肉食性鱼
C.杂食性鱼>肉食性鱼>草食性鱼
D.杂食性鱼>草食性鱼>肉食性鱼
