堤岸根基掏空的抢护原则是什么？
参考答案：
及时抛投料物，稳定基础。
—Is Mr. Black ill?
—_____ I think he will have to stay at home to have a good rest. [ ]
A. I don't think so.
B. I'm afraid not.
C. I hope so.
D. I'm afraid so.
AE中如何给一个层加多个文字特效？
