CDN
参考答案：
实现把内容从中心媒体服务器分发到边缘服务器的这样的网络体系，成为内容分发网络。
按序分配资源是为了( )。
A．死锁的检测
B．死锁的防
C．死锁的避免
D．死锁的解除
句型转换。
1. Those are Lucy's erasers. (改为单数句)
_______ is _______ _______.
2. She does housework every day. (改为否定句)
She _______ _______ housework every day.
3. I think tennis is very interesting.(对划线部分提问)
___ __ _______ you think is very interesting?
4. We play volleyball. (变成由Let开头的祈使句)
____ __ _______ volleyball.
5. She doesn't have a ruler. (变肯定句)
She _______ a ruler.
