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【简答题】
Conversation 2 Stuart: Amy, 1____________? Amy: Nothing special. What are you going to do? Stuart: Well, it is said that there will be a lecture on environmental protection on Saturday morning. I would like to attend it. 2__________? Amy: I’d love to. Speaking of environmental protection, what’s your opinion? Stuart: I think everyone should have the awareness and be activated to take actions to protect our mother earth. 3______________. Amy: I can’t agree more. Besides reducing the pollution, 4___________? Stuart: We should also develop renewable energy sources because the exciting coal based energy is limited and causes serious pollution. Amy: I understand. 5 _____________.
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【单选题】关于CSS3 动画说法正确的是()
A.
使用@keyframes 创建动画，把它绑定到一个选择器，否则动画不会有任何效果。
B.
当属性绑定一个选择器，可以不指定时常，动画会无限次播放。
C.
关键词 "from" 和 "to"，不同于 0% 和 100%，各自应用于不同的情况。
D.
动画播放的次数默认值是0。