瀑布模型突出的缺点是不适应______的变动。
A.算法
B.平台
C.程序语言
D.用户需求
参考答案:D
解析: 根据上一题的分析,可以得出结论,本题正确答案为选项D。
同学们学习很辛苦,很多同学的视力发生了变化,需进行矫正.请你从如图甲、乙两幅图中正确选出:矫正近视眼的是______.(选填:“甲”或“乙”)
—How was your summer holiday, Lily?
—I went to Beijing with my parents and we _________ a good time there.
A.have
B.had
C.have had
D.will have